The correct answer to this open question is the following.
The area of the United States that the British focused on winning was the Eastern colonies. The British wanted to invade and capture New York City for considering a strategic place and to establish its operation base.
The American Revolutionary War started in 1775, and the first thing the British troops wanted to accomplish was to control the rebellions in Massachusetts. Things started to complicate and the Continental Army started to win important battles. General George Washinton was named by the Continental Congress to be the leader of the Continental Army and with the help of the French, the American Colonies could defeat the British Army in 1783.
