Priestley continued the educational projects that had been important to him throughout his life, helping to establish a "Northumberland Academy" and donating his library to the fledgling institution. He exchanged letters regarding the proper structure of a university with Thomas Jefferson, who used the advice when founding the University of Virginia. Jefferson and Priestley became close and when he had completed his "General History of the Christian Church", he dedicated it to President Jefferson, writing that "it is now only that I can say I see nothing to fear from the hand of power, the government under which I live being for the first time truly favourable to me." Of all of the religious works Priestley published in the United States, and there were many, it was his four-volume "General History" that was the most important. Stretching from 475 CE to Priestley's present, he tracked and explained what he saw as the history of Christianity and its "corruptions", referencing his own "An History of the Corruptions of Christianity" (1772–74). However, he ended it by praising American religious toleration.