Answer:
On the other hand, the Americans had many intangible advantages.
The British fought a war far from home. Military orders, troops, and supplies sometimes took months to reach their destinations. The British had an extremely difficult objective. They had to persuade the Americans to give up their claims of independence. As long as the war continued, the colonists' claim continued to gain validity. The geographic vastness of the colonies proved a hindrance to the British effort. Despite occupying every major city, the British remained as at a disadvantage.
Americans had a grand cause: fighting for their rights, their independence and their liberty. This cause is much more just than waging a war to deny independence. American military and political leaders were inexperienced, but proved surprisingly competent.
The war was expensive and the British population debated its necessity. In Parliament, there were many American sympathizers. Finally, the alliance with the French gave Americans courage and a tangible threat that tipped the scales in America's favor.
SOURCE: http://www.ushistory.org/us/11a.asp
The Romans (Julius Cease 55 B.C.)
The Anglo-Saxons (449 A.D.)
The Vikings (793 A.D.)
The Normans (French; 1066 A.D. Battle of Hastings)
A lot of historians believe the battle of Fort Sumter was the start of the war, as it was the first official battle. However, there were zero casualties.
A lot of other people believe when Lincoln was elected was the start, because that event led many southern states to secede very quickly.
Europeans did not have the right to colonize other people. Although at the time they viewed themselves as the superiors of the world, colonizing other nations lead to many nations becoming similar to European countries and being forced to do labor rather than develop their own culture and system. Europeans could have achieved their goals of wealth and power without colonizing other people. This could've been achieved by creating alliances with nations they wished to colonize rather than completely taking them over. This would've lead to not only peaceful and larger relations but beneficial circumstances to both parties.
Hope this helps!