The American had a very strong feeling for patriotism. Serval colonies willingly chose to give their lives to defend their liberty, homes, children, and friends. Without that strong feeling of patriotism, the American War effort would have been horrible.
America had aid from counties such as France and to a lesser extent Spain. France was providing aid because they were motivated by the hatred of the English. About 85-90 percent of the Americans' gunpowder in the first two years of the way was provided by France
SHORT OF SUPPLIES
The American's greatest strength was George Washington. He was the commander and leader of the Army. George was very experienced and knew all of Britians tactics. Therefore he knew what their every move would be and how they fought, giving the Colonists a great advantage to win the war.
NOT VERY WELL TRAINED
The colonists always had short of qualified and capable men. The men had lack of manpower. It wasn't necessarily their fault either. However, they did not want to make the commitment to come together as a team and learn. Many of the troops would go back to their farms after they saw some progress as a military unit.
The American Army had lack of supplies. If it wasn't for France, they probably wouldn't have won. Ben Franklin himself suggested that it would be wiser to arm the soldiers with bows, arrows, hatchets, and knives. Lack of food storage forced many men to simply leave the force altogether. They even had a lack of shortage of shoes.
The colonists were not very well trained as opposed to the Britan Army. These men that were fighting for their freedom were once farmers, blacksmiths, and more low-class people. They had no knowledge of how to fire a gun. And this became very hard for the colonists and for George Washington.