Because popular sovereignty was well supported because it allowed the local citizens of a territory to decide if slavery was to be allowed or illegal. Stephen A. Douglas pushed for popular sovereignty during the 1840's.
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The Cold War essentially changed the way that people view other countries and how to approach future conflicts. In America, during the Cold War the Red Scare led many people to be against immigrants and other ideologies such as communism. There was also the threat of a Nuclear War between the Soviet Union and the US. Where both sides were forced to not fight because if they did the end of the world would ensue. Many countries were overtaken by the Soviet Union leading to them becoming communist countries as well.
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Americans wanted gold so they continued conquesting American in order to receive that gold
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The inner planets are the rock masses whereas the outer planets are the gas giants. The outer planets are Jupiter, Saturn, Uranus and Neptune.
For the answer to the question above, <span>the collapse of the Soviet Union aided in the helped the creation of the EU. It boosted the trade industry and increased the influence of European Union. For Nato, there was a strengthening with new allies </span>that are doubtful to join the alliance