Map - Greer County, Oklahoma (Greer County)

Greer County (Greer County)
Greer County is a county located along the southwest border of the U.S. state of Oklahoma. As of the 2010 census, the population was 6,239. Its county seat is Mangum. From 1860 to 1896, the state of Texas claimed an area known as Greer County, Texas, which included present-day Greer County along with neighboring areas. In 1896 it was designated as a county in Oklahoma Territory under a ruling by the US Supreme Court. The rural Greer County is home to Quartz Mountain State Park, near the community of Lone Wolf, Oklahoma. It is also home to the Oklahoma State Reformatory, located in Granite. Its population has declined since 1930 due to changes in agriculture and migration to cities for work.

After a dispute over the 1819 Adams-Onís Treaty and the related 1828 Treaty of Limits, the governments of both the United States and the state of Texas claimed ownership of some 1.5 million acres (6,000 km2) in what was then operated as Greer County, Texas. The county was named for former Texas lieutenant governor, John A. Greer. Litigation followed, and in the case of United States v. State of Texas, with a ruling issued on March 16, the Supreme Court, having original jurisdiction over the case, decided in favor of the United States.

The county was assigned to the Oklahoma Territory on May 4, 1896. When Oklahoma was admitted as a state, Greer County was established according to its current boundaries; the remaining former county area was organized as Harmon, Jackson, and part of Beckham counties. The town of Mangum, designated as the county seat in 1886 when this was part of Texas, continued as the seat of Greer County, Oklahoma. From its establishment until at least 1903, Greer County was a sundown county, prohibiting African Americans from living in the county.

Originally developed for agriculture, the rural county had its peak of population in 1930. Mechanization of agriculture reduced the need for farm labor, and the population has declined as people migrated to cities for work.

Among the county attractions is Quartz Mountain State Park (known from 2002 to 2020 as Quartz Mountain Nature Park), near the community of Lone Wolf.

 
Map - Greer County (Greer County)
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The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territories, nine Minor Outlying Islands, and 326 Indian reservations. The United States is the world's third-largest country by both land and total area. It shares land borders with Canada to its north and with Mexico to its south and has maritime borders with the Bahamas, Cuba, Russia, and other nations. With a population of over 333 million, it is the most populous country in the Americas and the third most populous in the world. The national capital of the United States is Washington, D.C., and its most populous city and principal financial center is New York City.

Indigenous peoples have inhabited the Americas for thousands of years. Beginning in 1607, British colonization led to the establishment of the Thirteen Colonies in what is now the Eastern United States. They quarreled with the British Crown over taxation and political representation, leading to the American Revolution and proceeding Revolutionary War. The United States declared independence on July 4, 1776, becoming the first nation-state founded on Enlightenment principles of unalienable natural rights, consent of the governed, and liberal democracy. The country began expanding across North America, spanning the continent by 1848. Sectional division surrounding slavery in the Southern United States led to the secession of the Confederate States of America, which fought the remaining states of the Union during the American Civil War (1861–1865). With the Union's victory and preservation, slavery was abolished nationally by the Thirteenth Amendment.
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