The two main factor that aided America's victory in the Revolution was the distance between Britain and American and support from the French. Since the war was fought in America, the Americans were on home soil and knew it better. It also meant that the British would have to travel across the Atlantic and retreat back for supplies and more men, which was quite inconvenient. However, the main reason for the victory was France's naval assistance and aid towards the end of the war. The British had one of the best navies at the time, it wasn't until the French helped out and assisted in the war that America was able to gain victory.
The United States emerged as a leading world power after world war I due to the treaty of Versailles. This is my best answer. I hope this helps! :)
Your answer is D. The German Army went through Belgium and made America get involved
