Your answer would be A because the Emancipation Proclamation only freed the slaves in the south until the South decided to come back to the US.
The 3 great empires were the Mughal, Ottoman, and the Safavid empire.
A two-thirds majority vote in both the House of Representatives and in the Senate is required to override a presidential veto. The exact number depends on how many representatives vote; therefore, the actual number is subject to chance
A peninsula is a land in which three sides of it is surrounded by water!
In this case, Europe in a peninsula because it is surrounded by three bodies of water. I would suggest you look at a map to get a deeper understanding.