The correct answer for 1 is Bay of pigs
It was a group of counter-revolutionaries who were trained by the CIA and sent to Cuba in order to overthrow Castro who came into power and who had more and more supporters. The United States didn't want there to be a communist regime in its neighborhood.
The correct answer for 2 is Tet
The Tet offensive was a victory for the United States and South Vietnam but it showed that North Vietnam was not an easy target and public found out that the war is actually a losing one. The sentiment turned and many Vietnam effort supporters stopped supporting it.
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If you aren't great at your passion you should still keep doing it, practice makes perfect. Don't forget that. Plus no one can just ace a test without studying, or learn to play soccer without practice. If you truly care about your passion, I know you'll improve.
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