The document summarizes key events from 1774 to 1783 during the American Revolutionary War. It describes how the British took control of Boston in 1774 and the battles of Lexington and Concord in 1775. It then discusses how George Washington was chosen as Commander-in-Chief of the Continental Army and some of the early challenges they faced. Finally, it outlines the British strategy to defeat the colonies, the pivotal American victory at Saratoga in 1777 which led France to join the Americans, and concludes with the British surrender at Yorktown in 1781 after being trapped by Washington and French forces, effectively winning the war for American independence.