Houston is the fourth-largest city in the United States of America and the largest city within the state of Texas. As of the 2006 U.S. Census estimate, the city has a population of 2.2 million within an area of 600 square miles. Houston is the seat of Harris County.
Houston was founded on August 30, 1836 by brothers Augustus Chapman Allen and John Kirby Allen on land near the banks of Buffalo Bayou. The city was incorporated on June 5, 1837 and named after then-President of the Republic of Texas - former General Sam Houston - who had commanded at the Battle of San Jacinto, which took place 25 miles (40 km) east of where the city was established. The burgeoning port and railroad industry, combined with oil discovery in 1901, has induced continual surges in the city's population. In the mid-twentieth century, Houston became the home of the Texas Medical Center - the world's largest concentration of healthcare and research institutions - and NASA's Johnson Space Center, where Mission Control Center is located. Houston has an active visual and performing arts scene in the Theater District and is one of few U.S. cities that offer year-round resident companies in all major performing arts.
Texas descended into anarchy two months between the surrender of the Army of Northern Virginia and the assumption of authority by Union General Gordon Granger. Violence also marked the early months of Reconstruction. Juneteenth commemorates the announcement of the Emancipation Proclamation on 19 June 1865 in Galveston by General Gordon Granger, over 2-1/2 years after the original announcement. President Johnson, on 20 August 1866, declared that civilian government had been restored to Texas. Despite not meeting reconstruction requirements, on 30 March 1870 the Congress readmitted Texas into the Union. Social volatility continued as the state struggled with agricultural depression and labor issues.