pls help
1. Which of the following was one of the keys to America's late 19th century industrial success?
A. Shipping by sea
B. Westward expansion
C. The telegraph
D. Railroads
2. Which of the following natural resources helped support the production of the steel used for the America's railroads, machines, and cities?
A. Iron ore
B. Gold
C. Coal
D. Oil
3. What was perfected by Henry Ford to help produce the Model T quickly and relatively cheaply?
A. The assembly line
B. The combustion engine
C. The electric engine
D. The incandescent lightbulb
4. Who is credited with the invention of the incandescent light bulb?
A. Henry Ford
B. Alexander Graham Bell
C. Nikola Tesla
D. Thomas Edison