The owner of the land didn’t want it anymore and needed money to fight its own battle, allowing the us to purchase a large chunk of land for 12 million!
This is a bit subjective, but it could be argued that social change had the biggest change in Southern life, since the abolition os slavery (which was inherently a social issue) led to the biggest changes.
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The u-2 spy incident increased the tension between the two nations and helped escalate the Cold War.U-2 flights were a voliation of soviet territory and risked a violent soviet response. Hope this helped:)
