Congress ordered that the draft "lie on the table" and then methodically edited Jefferson's primary document for the next two days, shortening it by a fourth, removing unnecessary wording, and improving sentence structure. They removed Jefferson's assertion that King George III had forced slavery onto the colonies, in order to moderate the document and appease those in South Carolina and Georgia, both states which had significant involvement in the slave trade. Jefferson later wrote in his autobiography that Northern states were also supportive towards the clauses removal, "for though their people had very few slaves themselves, yet they had been pretty considerable carriers of them to others." Jefferson wrote that Congress had "mangled" his draft version, but the Declaration that was finally produced was "the majestic document that inspired both contemporaries and posterity", in the words of his biographer John Ferling.