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In 1821, Mexico won its independence from Spain and Mexico-Texas was part of the new nation.
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Mexican authorities allows people from the U.S. to move to Texas. Soon, 3,000 Anglos lived in Texas compared to the 7,800 Mexicans that lived in Mexico. Many of these Anglo-American immigrants owned slaves and although slavery was outlawed in 1829 by Mexico, Texas was given a year to have slaves and demanded they be free by 1830. Even after 1830, they still had slaves by turning them into servants for life.
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Texas was not happy that the Mexican government allowed Anglo-Americans into Texas and they were also mad that Mexico tried to take away a small cannon that was given to them as a gift. Since the cannon itself was given to them without cannonballs, they filled the cannon with other small iron scraps to fire when Mexican authorities tried to get the cannon. They also painted a flag that said "Come and take it" symbolizing their resistance to return the cannon. This also began the Texas Revolution
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In 1836, Santa Anna personally sent troops to San Antonio during the Texas Revolution. Santa Anna signed the Treaties of Velasco which ended the Texas Revolution. Texas also becomes an independent nation, the Republic of Texas.
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Mexican troops led by Rafael Vásquez invaded Texas for the first time after the Texas Revolution. On September of 1842, San ANtonio was captured and the Battle of Salado Creek took place, effectively ending the Texas Revolution.
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On December 1845, President Polk signs the "Joint Resolution for the Admission of the State of Texas into the Union" which allows Texas to join the United States as the 28th state.
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2,000 Mexican men attacked a 63-man U.S. Patrol in what was later named the Thornton Affair and both nations (U.S. and Mexico) declared war.
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The Treaty of Guadalupe Hidalgo is signed and the Mexican-American war ends.
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Texas declares secession from the United States in order to protect slavery and joins the Confederate States of America.
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On September 8, 1900, Galveston was destroyed by a hurricane ("The Great Hurricane") and Galveston became the first city to implement a city commission government.