Why did many Americans assume slavery would fade away in the 19th century?

Four score and seven years ago our fathers brought forth on this continent a new nation, conceived in liberty, and dedicated to the proposition that all men are created equal. —"the gettysburg address," abraham lincoln which quotation correctly uses an ellipsis to shorten lincoln’s words?

What are some incentives that parties have to carry out their campaign promises?

In 1819, what did the united states obtain from spain for $5 million?