This is a big question. Civilization grows when you have a large population, a surplus of food, and a centralized government. The decline of civilization comes from warfare, repeated invasions, and disease.
Answer:
so the government could have more land
Many Americans supported imperialism because it was a chance to gain control of another country resources. Also, it was extending our power through military force. <span>https://courses.lumenlearning.com/.../chapter/american-imperialism </span>
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Answer: Some Americans disagreed with Truman’s support of civil rights for African Americans
Explanation: The main reason why Truman wasn't expected to win the 1948 election was because he had been a very uncharismatic and somewhat un-liked president under FDR.
It was a very deadly war--the Great War produced new forms of guns, bombs, and gas weapons which proved to be devastating.
The Great War, World War I, saw the emergence of tanks, rapid fire machine guns, grenades, mustard gas, and well as airplanes. The method of trench warfare in addition to highly accurate and deadly weapons led to both large numbers of causalities and stalemates. These weapons made it difficult to move position causing need for new techniques or new technology to allow movement.