I believe you are referring to the evacuation of Saigon (Fall of Saigon) on April 30, 1975. If so, the correct answer is c. The U.S. evacuated Vietnamese whose lives would be in the greatest danger if they were to be left behind.
Answer:
it controlled the Mediterranean sea and had territory in three continents
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There was 17 free states in 1850 and at least 20 in 1865
a poster could be like a big picture, with or without writing that represents something. this is placed on wall/on display