The mayflower compact was unique because it
a) was the foundation for the declaration of independence.
b) allowed black colonists freedom centuries before emancipation.
c) allowed colonists to import slaves from africa to work on southern plantations.
d) was the first example of colonial european self-government in northeastern north america.

The Mayflower Compact was unique because it D) was the first example of colonial European self-government in northeastern North America.

The Mayflower Compact, signed aboard a ship called "Mayflower" in Massachusetts, on November 11, 1620, was the first example of colonial European self-government in northeastern North America. It was made by the Pilgrims (The first English settlers) who also named the American colony "Plymouth".

The Pilgrims actually first intended to arrive in northern Virginia but they ended up landing in Massachusetts instead, near Cape Cod. When they realized they were out of Virginia's jurisdiction, they created the Mayflower Compact to established their authority and to prevent future conflicts among them.

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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the answer is actually b.   as habitats are destroyed, animals and plants may become extinct.   , according to edge nuity