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 20 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.
Personal computer, 1970s
Cotton gin, Eli Whitney, 1793
Refrigerated railroad car, 1870s
Steel plow, John Deere, 1837
A.Carried fresh meat across the country without spoiling
B.Cut through thick prairie soil so farmers could plant more land
C.Let one office worker do tasks that once took many people
D.Cleaned cotton fast, which led planters to enslave even more people
2.Draw a line from each one to its match.
Assembly line, Henry Ford, 1913
Telegraph, Samuel Morse, 1844
Light bulb, Thomas Edison, 1879
Barbed wire, Joseph Glidden, 1874
A.Built cars step by step, cutting the time to make one
B.Fenced huge areas cheaply and closed the open range
C.Sent messages along wires in minutes instead of weeks
D.Let factories and homes keep working after dark
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 20 · free to copy for classroom use
Answer key — Machines That Changed American Work
Set 20. Prints on its own sheet.
1.1. Personal computer, 1970s — C (Let one office worker do tasks that once took many people) 2. Cotton gin, Eli Whitney, 1793 — D (Cleaned cotton fast, which led planters to enslave even more people) 3. Refrigerated railroad car, 1870s — A (Carried fresh meat across the country without spoiling) 4. Steel plow, John Deere, 1837 — B (Cut through thick prairie soil so farmers could plant more land)
2.1. Assembly line, Henry Ford, 1913 — A (Built cars step by step, cutting the time to make one) 2. Telegraph, Samuel Morse, 1844 — C (Sent messages along wires in minutes instead of weeks) 3. Light bulb, Thomas Edison, 1879 — D (Let factories and homes keep working after dark) 4. Barbed wire, Joseph Glidden, 1874 — B (Fenced huge areas cheaply and closed the open range)
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.