That is because they think that should not be there
It's two of them, They were dependant on the USSR and They were neighboring states.
If you have to pick one, it's the first one I said.
Conquest by Tamerlane (Timur) and Mughal Empire. From 1383 to 1385, the Afghanistan area was conquered from the north by Timur, leader of neighboring Transoxiana (roughly modern-day Uzbekistan, Tajikistan, and adjacent areas), and became a part of the Timurid Empire.
Answer:
I would say C is the best answer
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President who resigned during the fall of saigon was President Nixon