Question: Squire Cheyney Farm is a historic farm and national historic district located in Thornbury Township, Chester County, Pennsylvania, Thomas "Squire" Cheyney, was later appointed to the Pennsylvania Ratifying Convention to ratify the United States Constitution, the supreme law of which country?
Sentence (from "Squire Cheyney Farm"): It is "L"-shaped and has a slate gable roof.
Relevant evidence: No