The answer would be : The Constitution
Many thought that congress is the one who limit the power of Government since they have the capabilities to decline a bill. But the highest hierarchy of power within every democratic countries fall to its constitution.
Whatever the congress and the Government planned on doing, it absolutely cannot stray from the constitution
1. They were not as organized as the British.
2. Shortage of supplies and ammo.
3. The Continental army had basically no Navy.