. Huntsville (38,548) (Huntsville Walker County Texas is not of the above 41 listed counties of East Texas.), Motorsports Houston Texas Business Directory, 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:. . 2015 Texas Population Estimate Program 2 Early Spanish exploration Japanese Imperial Army soldiers during the Battle of Shanghai 1937 Post-war division of the world was formalised by two international military alliances the United States-led NATO and the Soviet-led Warsaw Pact the long period of political tensions and military competition between them the Cold War would be accompanied by an unprecedented arms race and proxy wars. An expedition commanded by Pizarro and his brothers explored south from what is today Panama reaching Inca territory by 1526. After one more expedition in 1529 Pizarro received royal approval to conquer the region and be its viceroy the approval read: "In July 1529 the queen of Spain signed a charter allowing Pizarro to conquer the Incas Pizarro was named governor and captain of all conquests in New Castile" the Viceroyalty of Peru was established in 1542 encompassing all Spanish holdings in South America. 1860 4,845 102.2% Red Army troops in a counter-offensive on German positions at the Battle of Kursk July 1943. !
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