I believe it's the steam engine unsure with out answer choices <span />
Answer:
This famous poster was mainly meant to encourage people to protect their country. The poster shows Uncle Sam calling on people to join the army. Many Americans joined the army to help fight in the war and protect their country.
It’s B he developed the scientific method
Answer: The correct answer is B.
saw the price of cotton fall steadily
Explanation: Following the Civil War, white and black farmers in the South saw the price of cotton fall steadily.