The Columbian exchange caused Native Americans to come into contact with diseases like small pox, yellow fever, and malaria. Since they had not developed resistance to these types of illnesses, a lot of them died from it.
The deaths of all of these Native Americans caused for a labor shortage, which eventually lead to African slavery, since most of the Natives had died off.
Utah, Nevada, California, Arizona
Answer: d. mountain
Explanation:
When two continental plates collide, the boundary (subduction zone) is destroyed and rocks will start to pile up as the collision continues.
This will lead to the formation of mountains and mountain ranges which will also join the plates together. The Himalaya mountains for instance were formed when the Indian plate collided with that of Asia and as they are still colliding today, the Himalayas are still rising.
Children had to help with work on the farm, so they rarely went to school.
Answer:
A. Resuming unrestricted submarine warfare.
Explanation:
B. is the wrong war. The Americans didn't care much if at all, and were only somewhat concerned with the Zimmerman telegram.
C. Until Pearl Harbor, there had been no attacks on American soil ever.
D. America didn't directly intervene in the war effort, but did provide lend leases, such as tanks and guns.