"If I'm not mistaken, in 1790 New York was the 2nd largest slaveholding state behind Virginia."

The Slave population in 1790:

New Hampshire: 157
Massachusetts: 0
Rhode Island: 958
Connecticut: 2,648
New York: 21,193
New Jersey: 11,423
Pennsylvania: 3,707
Delaware: 8,887
Maryland: 103,036
Virginia: 292,627
North Carolina: 100,783
South carolina: 107,094
Georgia: 29,264

Franklin & Moss, "From Slavery to Freedom: A History of African Americans, 7th Ed.," p. 85 (McGraw-Hill, Inc. 1994).