I believe that the correct answer should be B), because he worsened the relations with the Soviet Union, relations that were much better during the time of previous president, Richard Nixon. It wasn't that much about the Afghan people, since he thought that i posed a""a grave threat to the free movement of Middle East oil". Also, he lost his 1980 election to Ronald Reagan, who promised-and delivered-an even more vigorous anticommunist foreign policy, which is why I strongly believe that the correct answer is B).
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How about the Boston Tea Party? I don't know much about it but I heard it's a good event to write about :)
The Knights of Labor collapsed after the Haymarket Square bombing. The group consisted of unskilled labor and skilled labor. The skilled labor decided to leave the Knights of Labor, forming AFL, because they felt that teaming up with the unskilled worker was more of a liability. However, the AFL and other unions eventually wore out because they made little to no progress in industrial America. They held thousands of strikes which pretty much led to dead ends and eventually the union dwindling.