二戰後,美國的外交政策是怎樣的?

題目：

二戰後,美國的外交政策是怎樣的?
需要英語版的回答.

解答：

A.1945---1991
The basic goal:to contain Soviet expansion and to finally bring about change in Soviet political system.
B.1991---
The basic goal:to maintain American domination in the world as long as possible and to remake the world in American image.