He found land and more people wanted to get in on it. Explorers wanted to find the “gold” that was supposedly there.Mainly the three G’s Gold, God, and Glory.
Hope that helped
Spain helped during the revolutionary war
America grew during the 1920's by Immigration and a powerful economy, becoming a world power in many regards. America was able to lend money to European nations, expand social programs and allow for many migrants to come into the United States. America also experienced rapid growth in the Industrial sector with many factories and innovations being designed.