What took place a few decades after the revolution

The United States in 1783

Explanation:

As a result of the Treaty of Paris, the United States was recognized by Great Britain as an independent nation. The British ceded a large amount of territory in what is today known as the American Midwest, basically everything between the original 12 colonies and the Mississippi river

answer; i do believe its (b) 12.5 years of age;

it's