Answer: Large territory, fertile farmlands, huge oil reserves, large population.
Explanation: The United States has one of the largest land mass in the world with a size of more than 9800km^2 most of this land area are of huge economic importance in the areas of : Tourism, farming, fishing, oil exploration, and housing.
Also the United States has a very large human population which serve as a huge market to producers, and also high work force for manufacturing.