Answer:
Before fully becoming involved in the war, America was sending a lot of goods and weapons and military needs to the other allied powers. After Pearl Harbor, they became fully involved in the war in both the European and Pacific Theaters, and really helped turn the tide of the war in favor of the allies, and eventually ended the Pacific Theater by dropping atomic bombs on Hiroshima and Japan.
Answer:
U.S. civil war... hope this helps :)
Explanation:
They had more training in the snow and rough conditions compared to the US. This made it much easier for them on the Eastern front.
The British won the French and Indian war, but it has exhausted their resources and money. They were in debt. In an attemp to get rid of this debt, they greatly increased taxes on American colonies for things like stamps, tea, and many other British imports. This was a big reason why the American colonists decided to rebel.
Hope this helps!