Answer: They were home.
Step-by-step explanation:
The American colonists were fighting for their homes and freedom on home soil. This was land that they knew very well and watching the British try to take it back from them gave them the motivation to fight.
They therefore had a stronger reason to fight than the British who were there to ensure that the British empire kept making money off of the American colonies. This stronger motivation ensured that even when the Colonists were outgunned and outmatched, they never gave up.