Houston is well known for its oil and petrochemical industries which are leading contributors to the city's economy the industries located along the ship channel coupled with a growing population have caused a considerable increase in air pollution for the city each year Houston has excessive ozone levels and is ranked among the most ozone-polluted cities in the United States. Ground-level ozone or smog is Houston's predominant air pollution problem in 2011 Houston was ranked as the 17th most polluted city in the US according to the American Lung Association a 2007 assessment found the following twelve air pollutants to be definite risks to health in Houston:; Colonization Mexicans displaced by the Mexican Revolution started flooding the city of Houston after 1910 and have been a strong influence in the city ever since, Texas Legislature Remington Ranch Lady Bird Taylor Johnson around age three in East Texas. The recorded history of Texas begins with the arrival of the first Spanish conquistadors in the region of North America now known as Texas in 1519 who found the region occupied by numerous Native American tribes the Native Americans' ancestors had been there for more than 10,000 years as evidenced by the discovery of the remains of prehistoric Leanderthal Lady During the period of recorded history from A.D 1519 to 1848 all or parts of Texas were claimed by five countries: France Spain Mexico the Republic of Texas and the United States of America as well as the confederacy during the the civil war; ; .
In 2012 the city was ranked number one for paycheck worth by Forbes and in late May 2013 Houston was identified as America's top city for employment creation. ! According to the 2010 United States census the racial composition of Texas was the following:. . 14 Notes 1.3 Reconstruction through 1900 Houston Texas Business Directory.
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