Houston is the most populous city in Texas, and the fourth most populous city in the United States. With a census-estimated 2013 population of 2.19 million people within a land area of 599.6 square miles, Houston is the largest city in the Southern United States. The city was named after former General Sam Houston, who was president of the Republic of Texas and had commanded and won at the Battle of San Jacinto 25 miles (40 km) east of where the city was established. 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 the Mission Control Center is located. Houston's economy has a broad industrial base in energy, manufacturing, aeronautics, and transportation.
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