Answer:
The Vietnam War had a profound effect on America. The war also drastically decreased Americans' trust in political leaders. In foreign policy, the U.S. suffered from the so-called Vietnam Syndrome: a fear of getting involved in foreign ground wars that might become long, bloody stalemates with no foreseeable end.
Trench warfare was the main style of war during World War I. It consisted of both sides of the war, called fronts, digging trenches in the ground for their soldiers to live and fight in. Trenches were deep ditches dug in the ground that were often cramped and dirty. As the dug trenches further forward, they would take more land in the battle.
This was a very slow process and often would result in tens of thousands of casualties for a few yards of land. This is especially true because of the heavy use of mounted machine guns that both sides of the war used. These guns would tear through enemies easily. This style of warfare was also vulnerable to bombings and gas attacks, as the soldiers were stuck in the trenches and the heavy poisonous gasses would sink into the trenches.
The truman doctrine offered aid to any country threatened by communism. SO any government that was liable to turn to communism the truman doctrine aided those countries so that those countries might instead turn to democracy.
A. The Europeans brought diseases like smallpox, and many Native Americans died.
