Machines That Changed American Work is a free printable Grade 3 to Grade 5 social studies worksheet on how inventions raised productivity, and what might come next, aligned to C3 Framework indicator D2.Eco.13.3-5. It prints 3 questions with an answer key on its own sheet of paper, in 25 versions that each ask different questions, so no two students in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.
Set 2 of 25 · the same problems every time you open this link.
Set 1 has all 25 in a single PDF. All 25 sets ask different questions.
Machines That Changed American Work
D2.Eco.13.3-5
NameDate
Draw a line from each invention to what it changed. Then write your prediction.
1.Draw a line from each one to its match.
Refrigerated railroad car, 1870s
Personal computer, 1970s
Cotton gin, Eli Whitney, 1793
Telephone, Alexander Graham Bell, 1876
A.Let people talk to each other over long distances
B.Cleaned cotton fast, which led planters to enslave even more people
C.Carried fresh meat across the country without spoiling
D.Let one office worker do tasks that once took many people
2.Draw a line from each one to its match.
Telegraph, Samuel Morse, 1844
Mechanical reaper, Cyrus McCormick, 1831
Light bulb, Thomas Edison, 1879
Steel plow, John Deere, 1837
A.Sent messages along wires in minutes instead of weeks
B.Let factories and homes keep working after dark
C.Cut through thick prairie soil so farmers could plant more land
D.Harvested wheat many times faster than by hand
3.The cotton gin helped planters but led to more people being enslaved. Explain why an invention can help some people and harm others, then predict one invention and who might be harmed by it.
I explained the cotton gin's effects.
I predicted an invention.
I named who it might help and who it might harm.
LessonPrint · D2.Eco.13.3-5 · Set 2 · free to copy for classroom use
Answer key — Machines That Changed American Work
Set 2. Prints on its own sheet.
1.1. Refrigerated railroad car, 1870s — C (Carried fresh meat across the country without spoiling) 2. Personal computer, 1970s — D (Let one office worker do tasks that once took many people) 3. Cotton gin, Eli Whitney, 1793 — B (Cleaned cotton fast, which led planters to enslave even more people) 4. Telephone, Alexander Graham Bell, 1876 — A (Let people talk to each other over long distances)
2.1. Telegraph, Samuel Morse, 1844 — A (Sent messages along wires in minutes instead of weeks) 2. Mechanical reaper, Cyrus McCormick, 1831 — D (Harvested wheat many times faster than by hand) 3. Light bulb, Thomas Edison, 1879 — B (Let factories and homes keep working after dark) 4. Steel plow, John Deere, 1837 — C (Cut through thick prairie soil so farmers could plant more land)
3.Explains that the cotton gin helped planters while leading to more enslaved people, then predicts an invention and names who it might help and who it might harm.
Last reviewed 2026-09-05. Aligned to D2.Eco.13.3-5 of the C3 Framework for Social Studies State Standards.