What does it mean for governments to have a “social contract”?

social contract in political philosophy an actual or hypothetical compact or, agreement between the ruled and their rulers defining the rights and duties of each ... they seen by exercising natural reason formed a society ( and a government) by means of a contract among themselves

a. because the u.s. was the leading with the most technology, economy, etc. also was teamed with other allies witch boosted the economy and materials to improve technology and use it.