They unified after Oda Nobunaga re-established the centralized government in which there was a strict hierarchy of people who were led by a Daimyo, that is, a feudal lord.
Answer:
A. existing European colonies
The Wilmot Proviso failed to win the passage in the Senate. However, its introduction sparked a political firestorm that was never seen before since the Missouri debates that happened from 1819-1821. The Wilmot Proviso proposed an American law to ban slavery in places that were acquired from Mexico.
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