👉 Intergradation is a legal concept in the United States that refers to the process of merging two or more states into one, often for political or economic reasons. It involves the sharing of resources and responsibilities among the states involved, as well as the exchange of citizens between them. The term "intergradation" was first used by Thomas Jefferson in his 1809 letter to Alexander Hamilton, describing the idea of creating a federal government that would combine the power and responsibilities of the thirteen original colonies.