There were a couple of reasons why USA figured out how to do that -
World wars - They didn't enter the world wars in the beginning periods. Thus the loss of labor was less when contrasted and different belligerents. Its territory was never assaulted straightforwardly. Most countries were obligation ridden, after the war. In any case, USA was in an exceptionally decent shape and helped amid the reconstructing procedure.
Union - After World war 2, the NATO and United Nations were framed. It empowered USA to assign its remote approach to different countries and they did it right.
Economy - The country has organized commerce concurrence with around 20 nations. The US dollar can be considered as the world money (informally).
Atomic weapons and military may - USA has the most exceptional military on the planet. They are dreaded by other world countries. China is contending so energetically to guarantee that USA doesn't remain long in its terrace. They have a decent store of weapons of mass demolition and are fit for going atomic. Rocket safeguard framework and an extremely decent digital security is accessible available to them.
Access to oil and different assets - They deliver over half of the oil they devour and are in extremely great terms with the greater part of the center eastern countries. They can fuel their war machines. It has colossal stores of characteristic assets.