There are of course several things that President Lincoln risked if he chosed not to resupply Fort Sumter, but the greatest was that he would lose the respect of his Northern allies.
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Marco Polo was deeply impressed by the East. As a european from the XIII century, he wasn't used to the sight of so much trade, luxury and comfort. He travelled through the whole Silk Road, but it was China, and especially its capital Beijing, what made the biggest impression on him. On this excerpt he describes the city as A large city with vibrant foreign trade.
Castro shared good relations with US Cold War rival, the Soviet Union.
Castro brought US-owned industries under government’s control.
Castro declared that he would assassinate US president Dwight Eisenhower and destroy the US government.
They did it by appealing to their racism. The democrats in the south were the ones who were the confederacy in the civil war and after that they had to accept African-Americans even though they didn't want to. Conservative republicans used this to get them to vote for them because the racist democrats believed that northern democrats abandoned them.