It was important because segregation and discrimination had reached a point were it was no longer tolerable To state that African Americans should join the war because a win would be a double victory over racism abroad and at home.
A stalemate is a a position counting as a draw, in which a player is not in check but cannot move except into check.
Black Dispatches was a common term used among Union military men in the American Civil War for intelligence on Confederate forces provided by African-Americans. This source of information represented a prolific and productive category of intelligence obtained and acted on by Union forces throughout the Civil War.