Despite American losses during the Battle of Brooklyn, most of the soldiers including Washington escaped before being killed.
You Are now Leaving New York
Washington felt that a victory before the end of the Year was necessary to keep soldiers in the army before they could leave, so he took over the forts of Trenton and Princeton to boost the soldiers morale.
America is now a country!
The battle of Saratoga was actually two consecutive minor battles, the first being a victory for British although this victory might as well have been a loss. The patriots won the second battle.
The smallpox that the soldiers got during their stay in valley forge was so lethal, Washington had to hire an inspector to prevent all of this soldiers from dying.
The Battle of Yorktown was the last battle of the revolution. The British were concerned that a French assault on Britain would occur. It was a victory for the Americans and ended the revolutionary war.