1776 began with British forces in Boston under seige by the
colonials. When a small group of men led by Benedict Arnold and
Ethan Allen captured Fort Ticonderoga in New York's northern
wilderness and sent its many cannon back to Boston, the British
were forced to evacuate.
From there, Washington moved the troops to New York City but was
himself forced out when the British took control of it. They
pursued him to Brooklyn and into New Jersey. By the end of 1777,
they had captured Philadelphia. But most of the fighting was in New
York (the loss of NYC, the battle of Long Island, the retreat from
Quebec, and the Saratoga campaign and its related battles) and New
Jersey (the battles of Trenton, Princeton, and Morristown).