Answer: 1. The Failure to Capture or Disband Washington's Army
The Revolution persisted because George Washington was able to keep his army intact. General William Howe lost a grand opportunity in New York to capture Washington and end the war, but failed to do so and allowed the crafty general to make a daring retreat in the night.
2. Parliament Opinion On The War Was Split
Before the war ever began Parliament had passionate discussions over whether the British colonies had the same rights as British Citizens.
3. The Franco-American Alliance
Anyone who has studied the American Revolutionary War knows how important this alliance was to the cause of American Liberty. The Franco-American alliance brought the French into the war.
4. Lack of Loyalist Support
This was a problem for the British throughout the war but was the most evident in the Southern theatre. The British believed that they had overwhelming support for the crown in the south and sought to raise many loyalist armies to fight the Americans.
5. Inability to Efficiently Supply the British Army
The Battle of Trenton, Princeton, Guilford Courthouse, Cowpens, and Yorktown were all American successes due to the inability of the British Army to supply their army.