Sullivan's men returned from the campaign to Pennsylvania and New England to tell of the enormous wealth of this new territory. Many of them were given land grants in gratitude for their service in the Revolution. From 1786 through 1797 several groups of wealthy land speculators entered into agreements with one another, with neighboring states, and with the Indians to obtain title to vast tracts of land in western New York. Some purchases of Iroquois lands are the subject of numerous modern-day land claims by the individual nations of the Six Nations.
For the Oneida nation's assistance in defeating the British, primarily assisting General Washington's army at Valley Forge, then President Washington while on tour of the Mohawk Valley signed the Treaty of Canandaigua. This Treaty promised the Oneidas among other things a large swath of land from Pennsylvania to Canada, forever. The Treaty was violated in the mid-1800s by New York State. This became the basis for the present land claim dispute.
After the end of the American Revolutionary War, Isaac Sears and others, in New York City, revived the Sons of Liberty. In March 1784, they rallied an enormous crowd which called for the expulsion of any remaining Loyalists from the state starting on May 1. The Sons of Liberty gained sufficient seats in the December, 1784 election to have enacted punitive Loyalist laws. These laws remained in effect until, 1786 when Loyalists not banned by name were allowed to return to the state, 1788 when confiscation of Loyalist property was stopped, and 1792 when those banned by name were allowed to return to the state provided they did not contest their previous forfeiture of their property.
The new federal United States Constitution was controversial in New York. The Federalist Papers, largely written by New Yorker Alexander Hamilton, were printed in local newspapers to convince voters to support ratification. On July 26, 1788, New York became the 11th state in the union, and New York City became the federal capital until 1790.