Westmoreland County, Connecticut was a county established by the State of Connecticut in October 1776, encompassing the present-day area of Wyoming Valley, in northeastern Pennsylvania.
[1] In December 1782 a court of arbitration appointed by the Continental Congress met in Trenton, New Jersey, and made a unanimous decision in favor of Pennsylvania's claim.
In compensation, Connecticut received equivalent territory of 3,300,000 acres named the Western Reserve, in the future northeast of Ohio.
Pennsylvania then refused to confirm the private land titles of the settlers, which caused the Second of the Yankee-Pennamite Wars.
[1] It has no relationship to the current Westmoreland County, Pennsylvania, which is located on the western and opposite side of the state.