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?
Context: Cheyney University of Pennsylvania is a public, co-educational historically black university that is a member of the Pennsylvania State System of Higher Education.  Cheyney University has a 275 acre campus that is located in Cheyney, Pennsylvania, a community within Thornbury Township, Chester County, Pennsylvania and Thornbury Township, Delaware County (school straddles both counties), in the state of Pennsylvania.  Cheyney University is a member-school of Thurgood Marshall College Fund.  The university offers bachelor's and master's degrees.  In November 2015, the Middle States Commission on Higher Education placed Cheyney University on probation.  Administrators are required to address a variety of issues including finances, leadership, and assessment of learning. Paradise Valley Historic District is a national historic district located in East Bradford Township, Chester County, Pennsylvania.  It encompasses 25 contributing buildings, 10 contributing sites, and 10 contributing structures in rural Chester County.  It includes a variety of vernacular stone farmhouses, bank barns, farm outbuildings, a stone bridge, two mill races, and a small family graveyard.  Notable properties include the William Mercer Farm, Samuel Starr Farm, George Jefferis Farm, Thomas Price Farm, Spackman's Mill site, Hannum Mill site, and Enoch Pearson Farm. Thornbury Township is a township in Delaware County, Pennsylvania, United States.  The population was 8,028 at the 2010 census, up from 7,093 at the 2000 census.  It is adjacent to, and was once joined with, Thornbury Township, Chester County, Pennsylvania.  It contains part of the census designated place of Cheyney University. Middle Pickering Rural Historic District also known as the Pickering & Pigeon Run Rural Historic District, is a national historic district located in Charlestown Township, East Pikeland Township, and West Pikeland Township, Chester County, Pennsylvania.  It is adjacent to the Charlestown Village Historic District.  It encompasses 76 contributing buildings, 5 contributing sites, and 15 contributing structures in rural northern Chester County.  Included are 15 farmsteads dated to the 18th or 19th century, two Lutheran churches and cemeteries, the sites os two small industrial complexes, and the tiny village of Merlin.  Located in the district and listed separately is the Oskar G. Stonorov House. Chester Creek Historic District is a national historic district located along the west branch of Chester Creek at Thornbury Township, Delaware County, Pennsylvania.  The district includes 52 contributing buildings and 5 structures associated with the early settlement and industrial development of the Chester Creek valley.  Notable buildings and structures include the Yarnall Bank House, Locksley Mill and Manor House (1704), John Edwards House, Glen Mills Station (1882), Station House and Store (c. 1882), Willcox Mills (c. 1850), Workers' Cottages (c. 1830-1880), Daniel Broomall House, and the Hemphill House. Springton Manor Farm is a historic farm and national historic district located in Wallace Township, Chester County, Pennsylvania.  The farm has 14 contributing buildings, 1 contributing site, and 5 contributing structures.  They include the main house, a cistern (c. 1870), tool shed (c. 1850), privy (c. 1840), spring and milk house (c. 1836), carriage house (c. 1840, 1887), small barn (c. 1845), corn crib (c. 1845), bank barn (c. 1750), stone lean-to (c. 1711, 1745), the ruins of a stone spring house (c. 1735), and hydraulic dams (c. 1870).  The main house is in three sections; the earliest dates about 1836, with additions and modifications made in 1887 and 1912.  It is a 2 1/2-story, seven bay by two bay, stuccoed stone dwelling with Georgian and Queen Anne style design details.  Originally built by Joseph Muckleduff in the early 1700s.  Upon Joseph's death 9 Sep 1750, Springton Manor was left to his brother Samuel Muckleduff.  [Chester Co PA Wills & Mention in Wills 1713 - 1825].  It was the home of Congressman Abraham Robinson McIlvaine (1804-1863).  The property is administered as a park and agricultural history museum by Chester County. Worth–Jefferis Rural Historic District is a national historic district located in East Bradford Township and West Bradford Township, Chester County, Pennsylvania.  It encompasses 42 contributing buildings and 5 contributing sites in rural Chester County.  It includes a variety of vernacular stone farmhouses, Pennsylvania bank barns, and farm outbuildings.  Notable properties include the Georgia Farm (1740), Glen-Worth Farm, Barr Farm, Lucky Hill Farm, Blue Rock Farm, Allerton Farm, Barry Farm, and Sarah Baldwin Farm.  Located within the district is the separately listed Carter-Worth House and Farm. Squire Cheyney Farm is a historic farm and national historic district located in Thornbury Township, Chester County, Pennsylvania.  The district encompasses two contributing buildings, three contributing sites, one contributing structure, and contributing object.  They are the farmhouse, barn (c. 1804, c. 1820, c. 1875, 1881, and c. 1910), ruins of a granary, remains of an ice house, a spring house (1799), stone retaining wall, and family cemetery (established c. 1803).  The house was built in four periods, with the oldest dated to about 1797.  The oldest section is a 2 1/s-story, three bay, stuccoed stone structure with a gable roof.  The additions were built about 1815, about 1830, and about 1850, making it a seven-bay-wide dwelling.  It is "L"-shaped and has a slate gable roof.  During the American Revolution, Thomas "Squire" Cheyney [II] informed General George Washington during the Battle of Brandywine that the British were flanking him to the north.  He was later appointed to the Pennsylvania Ratifying Convention to ratify the United States Constitution.  The site is now a township park known as Squire Cheyney Farm Park. Thornbury Township is a township in Chester County, Pennsylvania, United States.  The population was 3,017 at the 2010 census.  It is adjacent to, and was once joined with, Thornbury Township, Delaware County, Pennsylvania. The United States Constitution is the supreme law of the United States of America.  The Constitution, originally comprising seven articles, delineates the national frame of government.  Its first three articles entrench the doctrine of the separation of powers, whereby the federal government is divided into three branches: the legislative, consisting of the bicameral Congress; the executive, consisting of the President; and the judicial, consisting of the Supreme Court and other federal courts.  Articles Four, Five and Six entrench concepts of federalism, describing the rights and responsibilities of state governments and of the states in relationship to the federal government.  Article Seven establishes the procedure subsequently used by the thirteen States to ratify it.
Answer: United States of America