Why did the détente end?

Overall, there were many causes of the end of Detente. The main reasons include the Soviet invasion of Afghanistan being the last straw for Carter, and the fact that the US influence was rapidly decreasing worldwide, shown by the incident in Teheran in Iran.

Explanation:

in 550 b.c.e. cyrus the great, the leader of the persians, conquered the medes and united the iranian people under one ruler for the first time. cyrus became the first king of the persian empire and went on to establish one of the largest empires in world.

- "a new era of american politics began with jackson's election in 1828, but it also completed a grand social experiment begun by the american revolution. nevertheless, jacksonian democracy represented a provocative blending of the best and worst qualities of american society."

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