Answer:
The industrial revolution happened
Step-by-step explanation:
The US and UK were one of the first ones to industrialize for a reason, they were protected by the sea. They didn't have to take any part in any war and could focus on internal stability. The industrial revolution also introduced a lot of new inventions like the cotton gin, which helped boom America's cotton industry in the south. America is a very rich country in terms such as resources, from the oil in Texas to the steel in Michigan.