New York was inhabited by the Algonquin, Iroquois, and Lenape groups of Native Americans at the time Dutch and French nationals moved into the region in the early 17th century. First claimed by Henry Hudson in 1609, the region came to have Dutch forts at Fort Orange, near the site of present-day Albany in 1614, and was colonized by the Dutch in 1624 at both Albany and Manhattan; it later fell to British annexation in 1664.
The borders of the British colony, the Province of New York, were roughly similar to those of the present-day state. About one third of all of the battles of the American Revolution took place in New York. New York became an independent state on July 9, 1776 and enacted its constitution in 1777. The state ratified the United States Constitution on July 26, 1788 to become the 11th state.
New York's borders are different than in the OTL. Along with the western section carved out as the Six Nations, the area of what will be OTL Vermont remains part of New York, making the province border New Hampshire to the east. Prior to the Point of Divergence, both New York and New Hampshire claimed Vermont, and how the NAU settled this border dispute is not addressed.