The American Revolution was an uneven fight between 1775-1783, with Britain having advantages in military strength and resources over the American colonists. Key turning points included the Continental Army's surprise victory at Trenton and the British surrender at Saratoga, which convinced France to ally with the Americans. With further support from France and other countries, Washington was able to trap Cornwallis' forces at Yorktown in 1781, marking the last major battle. The Treaty of Paris in 1783 officially recognized American independence.