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AP US History
Unit 9 – Entering Into the 21st Century, 1980–Present
Topic 9.4
Which invention had a critical impact on agriculture during America's transition towards an industrial economy?
Telecommunication lines
Automobiles
Cotton Gin
Steam engine trains
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AP US History - 9.4 A Changing Economy
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Agriculture
America's Transition
Industrial Economy
Invention
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About Us
About Fiveable
Blog
Careers
Testimonials
Code of Conduct
Terms of Use
Privacy Policy
CCPA Privacy Policy
Resources
Cram Mode
AP Score Calculators
Study Guides
Practice Quizzes
Glossary
Crisis Text Line
Request a Feature
Report an Issue
© 2024 Fiveable Inc. All rights reserved.
AP® and SAT® are trademarks registered by the College Board, which is not affiliated with, and does not endorse this website.
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