The American civil war. The south is the blue, the north is red. The south didn’t need to capture any Northern Territory, whereas the north wanted to take over the south so that they could keep the states united, hence the Union.
Were given permission to punish non-native american tresspassers.
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The 1987 Intermediate-Range Nuclear Forces (INF) Treaty was significant because it required the US and Soviet Union to eliminate all nuclear and ground-based ballistic missiles and cruise missiles. This was big, because it reduced the threat of nuclear war all over the world. Without missiles, the world had a much less threat of destruction.
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Andrew Jackson's presence in Florida. This treaty, signed in 1819, settled all border disputes between Spain and the US. Spain gave east Florida to the US, and the US gave up its claims to what is now Texas.
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