Actually, Kentucky WAS once a part of Virginia. Kentucky was organized as a commonwealth in 1792. West Virginia, of course, was als a part of Virginia which broke off during the Civil War.

I cite <http://www.thegreenpapers.com/slg/KY.html>;
The COMMONWEALTH of Kentucky never organized as a Territory: previously, part of the Commonwealth of Virginia
Admitted to the Union as a State: 1 June 1792 the date for achieving Statehood had been set in the Enabling Act
The 15th state.>

That of course doesn't preclude migration from Pennsylvania.