What do the battle Trenton and Princeton, the battle of Saratoga, and the battle of Yorktown have in common?

The Continental Army basked in its achievements—at Princeton they had defeated a regular British army in the field. Moreover, Washington had shown that he could unite soldiers from all the colonies into an effective national force.

Explanation:

the lowest among the social higher rank were the working class. this class remained detached to the political progression   of the country and was hostile to the other two classes

besides the fact that abraham lincoln abolished slavery, and greatly benefit black people, he had a heavy impact of the definition of what democracy was, and should be.