The United States has resources plus many people with technical skills that built up country's economy and make it a world's one of the best developed and advanced country.
Step-by-step explanation:
United State is one of the developed country with highly developed technological advancement, abundance of natural resource which is easily transformable to resource by utilizing it with proper human resource. Many people has highly developed technical skill which up graded country's standard and economic position through out the world.
Like United States Europe and other western countries are also have technically skilled persons with adequate natural resource which helps them to be a superior country in the world.