What name did the north give themselves at the start of the Civil War

During the American Civil War (1861–1865), the Union, also known as the North, was composed of the U.S. states that were loyal to the U.S. federal government led by President Abraham Lincoln. Altogether, it included 20 free states and 5 border states.

Combatants: Confederate States of America

Explanation:

the answer is selfishly. hope this !

letter a is the answer