| Learning Objective | Preview: Unit 6 Key Concepts |
|---|---|
Unit 6.A |
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| Thematic Focus | Learning Objective | Historical Developments |
|---|---|---|
MIG | Unit 6.B |
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| Thematic Focus | Learning Objective | Historical Developments |
|---|---|---|
MIG | Unit 6.B |
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AP United States History · Topic 6
7:17
Period 6: 1865 to 1898
Here is the puzzle at the centre of this period. An American farmer in 1890 grew more wheat than his father ever had, with better machines, on more land…
English narration · English + 中文 subtitles burned in
| Learning Objective | Preview: Unit 6 Key Concepts |
|---|---|
Unit 6.A |
|
| Thematic Focus | Learning Objective | Historical Developments |
|---|---|---|
MIG | Unit 6.B |
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| Thematic Focus | Learning Objective | Historical Developments |
|---|---|---|
MIG | Unit 6.B |
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Source: College Board AP Course and Exam Description
Period 6 runs from 1865 to 1898 - the Gilded Age 镀金时代. Industry, migration, and the West transform the country, and every transformation produces a political argument about who benefits.
Improvements in mechanization 机械化 raised agricultural production substantially, while railroads carried crops to national and world markets. But the same forces squeezed farmers: consolidation in agricultural markets 农产品市场集中化 left them facing high freight rates, expensive credit, and falling crop prices.
Westward settlement also meant the final dispossession of American Indians. Federal policy moved from treaties to reservations 保留地 and then to assimilation 同化 through the Dawes Act 道斯法, which divided communal land into individual plots and transferred the surplus to settlers.


| English |
|---|
| Gilded Age/ˈɡɪldɪd eɪdʒ/ |
| mechanization/ˌmekənaɪˈzeɪʃn/ |
| consolidation in agricultural markets/kənˌsɒlɪˈdeɪʃn ɪn ˌæɡrɪˈkʌltʃərəl ˈmɑːkɪts/ |
| reservations/ˌrezəˈveɪʃnz/ |
| assimilation/əˌsɪmɪˈleɪʃn/ |
| Dawes Act/dɔːz ækt/ |
| Thematic Focus | Learning Objective | Historical Developments |
|---|---|---|
NAT | Unit 6.C |
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| Thematic Focus | Learning Objective | Historical Developments |
|---|---|---|
WXT | Unit 6.D |
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| Thematic Focus | Learning Objective | Historical Developments |
|---|---|---|
WXT | Unit 6.E |
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Source: College Board AP Course and Exam Description
Industrial growth involved technology, management, a growing workforce, wider markets and pro-growth government policies. Businesses used new corporate structures 公司组织形式, including trusts and holding companies, for consolidation 合并: bringing firms under concentrated control.
Try it — distinguish mechanisms. Teacher-written cases: A business adopts new machinery and management methods to produce more goods. Several firms are brought under a large trust or holding company. Better transport and communication connect producers with more distant markets. Explain which changes production, which changes ownership, and which changes market access. Which most directly shows consolidation?
Worked mechanisms. New technology and management could raise output; more goods alone do not prove that fewer owners control an industry. Trusts and holding companies concentrated control over businesses and wealth. Transport and communication connected producers with wider markets. Businesses also sought markets and natural resources outside the United States. These mechanisms could interact; they are not interchangeable labels for growth.
Try it — assess two claims. Teaching evidence paraphrased from CED Topics 6.6–6.7: many goods became cheaper, workers' real wages increased, and many Americans could afford more goods and services. At the same time the gap between rich and poor grew, and consolidation concentrated wealth. Claim A says that if workers could buy more, inequality must have fallen. Claim B says that if inequality grew, no worker's living standard could improve. Assess both, distinguishing purchasing power from the distribution of wealth.
Worked judgment. Lower prices could let wages buy more goods and services. Living standards could improve without workers becoming as wealthy as business owners. Wealth could become more concentrated while many workers' purchasing power improved, so neither claim follows. Improved affordability also did not end disputes over wages and working conditions.
Some defended laissez-faire 自由放任, arguing that competition promoted long-term growth and opposing government intervention during economic downturns. This was a policy argument; it does not mean government was absent from industrial development. Pro-growth government policies also helped industrial growth. Many living standards improved alongside rising inequality 不平等加剧; downturns and labour conflicts prompted debates over policy.


| English |
|---|
| corporate structures/ˈkɔːpərət ˈstrʌktʃəz/ |
| consolidation/kənˌsɒlɪˈdeɪʃn/ |
| laissez-faire/ˈleɪsez feə/ |
| rising inequality/ˈraɪzɪŋ ɪniːˈkwɒlɪti/ |
| Thematic Focus | Learning Objective | Historical Developments |
|---|---|---|
WXT | Unit 6.E |
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Source: College Board AP Course and Exam Description

A variety of perspectives 各种不同的立场 on the economy and labour developed. Workers faced long hours, dangerous conditions, and wages that fell during downturns.
They organised. Unions such as the Knights of Labor 劳工骑士团 and the American Federation of Labor 美国劳工联合会 differed over who to admit and what to demand - the AFL concentrating on skilled workers and practical gains in wages and hours. Strikes 罢工 were frequent, often large, and frequently broken by state or federal force, which itself became an argument about the role of government.

The two organisations differ strategically, not by degree — and the narrower aim is the one that survived.
| English |
|---|
| variety of perspectives/vəˈraɪəti ɒv pəˈspektɪvz/ |
| Knights of Labor/naɪts ɒv ˈleɪbə/ |
| American Federation of Labor/əˈmerɪkən ˌfedəˈreɪʃn ɒv ˈleɪbə/ |
| Strikes/straɪks/ |
| Thematic Focus | Learning Objective | Historical Developments |
|---|---|---|
MIG | Unit 6.F |
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| Thematic Focus | Learning Objective | Historical Developments |
|---|---|---|
MIG | Unit 6.G |
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Source: College Board AP Course and Exam Description
International and internal migration increased urban populations and fostered the growth of cities 城市.
New arrivals came increasingly from southern and eastern Europe 南欧与东欧, alongside Chinese migration to the West - which met the Chinese Exclusion Act 排华法案, the first significant federal restriction on immigration by nationality.
In cities where access to power was unequally distributed, political machines 政治机器 provided jobs, housing help, and services in exchange for votes - corrupt by later standards, and for many migrants the only functioning source of support.
Migration also produced organised hostility. Nativist movements argued that new arrivals threatened wages, culture, or self-government.

The political machine and the nativist are simultaneous responses to the same arrival. Only one of them ends in a law.
| English |
|---|
| cities/ˈsɪtiz/ |
| southern and eastern Europe/ˈsʌðən ænd ˈiːstn ˈjʊərəp/ |
| Chinese Exclusion Act/tʃaɪˈniːz eksˈkluːʒn ækt/ |
| political machines/pəˈlɪtɪkl məˈʃiːnz/ |
| Thematic Focus | Learning Objective | Historical Developments |
|---|---|---|
SOC | Unit 6.H |
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| Thematic Focus | Learning Objective | Historical Developments |
|---|---|---|
SOC | Unit 6.I |
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Source: College Board AP Course and Exam Description
Corporations' need for managers 管理人员 and for male and female clerical workers 文职人员 expanded a new middle class 中产阶级, with new patterns of consumption and leisure.
Cultural and intellectual movements both buttressed and challenged 既支持又挑战 the social order:

| English |
|---|
| managers/ˈmænɪdʒəz/ |
| clerical workers/ˈklerɪkl ˈwɜːkəz/ |
| middle class/ˈmɪdl klæs/ |
| buttressed and challenged/ˈbʌtrəst ænd ˈtʃælɪndʒd/ |
| Social Darwinism/ˈsəʊʃl ˈdɑːwɪnɪzəm/ |
| Gospel of Wealth/ˈɡɒspl ɒv welθ/ |
| moral obligation/ˈmɒrəl ˌɒblɪˈɡeɪʃn/ |
| voluntary organizations/ˈvɒləntəri ˌɔːɡənaɪˈzeɪʃnz/ |
| Thematic Focus | Learning Objective | Historical Developments |
|---|---|---|
PCE | Unit 6.J |
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| Thematic Focus | Learning Objective | Historical Developments |
|---|---|---|
PCE | Unit 6.K |
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Source: College Board AP Course and Exam Description
The major parties appealed to lingering divisions from the Civil War and competed over patronage 政治分肥 more than policy, producing close elections and limited legislation.
Economic instability drove agrarian activists to build the People's (Populist) Party 人民党, demanding government action: regulation of railroads, currency reform, and a graduated income tax. Populism failed as a party but placed on the agenda the idea that government should intervene in the economy - the argument Period 7 takes up.
Debates over citizenship 公民身份, race, and the role of government ran through all of this, as the rights promised during Reconstruction continued to be narrowed.
| English |
|---|
| patronage/ˈpætrənɪdʒ/ |
| People's (Populist) Party/ˈpiːplz ˈpɑːti/ |
| citizenship/ˈsɪtɪzənʃɪp/ |
| Learning Objective | Review: Unit 6 Key Concepts |
|---|---|
Unit 6.L |
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Source: College Board AP Course and Exam Description
Continuity and change is one useful reasoning skill for this period. Industrialisation changed where people lived and what they did, while inequality, sectional political loyalties, and racial exclusion persisted.
Exam transfer — 2024 AP US History, Set 2, short-answer Q4(a–b), paraphrased. A asks for one economic development from 1865 to 1900. B asks for one similarity or difference in how two groups responded to economic change in those dates. Try A using corporate consolidation, and B comparing supporters of laissez-faire with Populist advocates of railroad regulation. Give relevant characteristics and explain the relationship rather than only naming a term or two groups.
Teacher-written model for A. Corporate trusts emerged as a business structure that brought multiple firms under concentrated control, helping owners consolidate businesses.
Teacher-written model for B. Some business supporters of laissez-faire opposed government intervention, trusting competition to promote growth. Populists called for government regulation of railroads to address farmers' grievances. They differed over whether government should regulate economic activity.
Why these fit. The official scheme accepts corporate trusts for A and contrasting laissez-faire with demands for regulation for B. The models describe a development and explain a difference within the dates. These are our models, not official samples or guarantees of credit. Only parts (a–b) are addressed here; part (c) asks about 1900–1940.
Each part needs only one or two sentences: answer the question, cite one specific piece of evidence, and explain how it supports the answer.
Answer (a), (b) and (c).
(a) Briefly describe ONE cause of rapid industrial growth after the Civil War.
(b) Briefly describe ONE way workers responded to industrial working conditions.
(c) Briefly explain ONE effect of federal policy on Native Americans in this period.
Model answer.
Vocabulary card meanings
Gilded Age: The late nineteenth century of industrial wealth and stark inequality. mechanization: Replacing hand work with machines on farms and in factories. consolidation in agricultural markets: Fewer, larger firms controlling the buying and selling of farm products. reservations: Lands onto which the government confined Indigenous nations. Dawes Act: The 1887 law that broke up tribal land into individual allotments. corporate structures: Legal forms such as trusts that organised large businesses. consolidation: Combining firms so that fewer companies controlled an industry. rising inequality: A widening gap between the wealthy and everyone else. variety of perspectives: Workers, farmers, and owners explaining industrial change in different ways. Knights of Labor: A broad late-nineteenth-century union open to many kinds of workers. American Federation of Labor: A union federation organised mainly by skilled craft. Strikes: Organised refusals to work, used to press employers. cities: Large urban centres that grew with factories and newcomers. southern and eastern Europe: The regions that supplied many immigrants around 1900. Chinese Exclusion Act: The 1882 law that barred most Chinese labourers from immigrating. political machines: Party organisations that traded services for votes in cities. managers: Salaried staff who directed work inside large firms. clerical workers: Office employees who kept records and correspondence. buttressed and challenged: Both supported an existing order and put it under pressure. Gospel of Wealth: The argument that the rich should use their fortunes for the public good. moral obligation: A duty claimed on ethical grounds, not only by law. patronage: Giving government jobs to political supporters. People's (Populist) Party: A late-nineteenth-century party of farmers and workers demanding economic reform. citizenship: Legal membership in the nation, with the rights that membership carries.
Work through it step by step, with instant-check exercises.
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