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====Republic of Texas====
251px|Flag for the Republic of Texas (1835-39)]]
Americans, always on the lookout for a good fight, fought on the side of Mexico against Spain. After winning of independence for Mexico many of those Americans began settling in Mexican land, most notably Stephen F. Austin who crossed the Brazos River and set up a colony that came to be known as Mexican Texas. So many farmers were staking out land that alarms went up in Mexico City and President Anastasio Bustamante banned all immigration of United States citizens to Texas in 1830. <ref>Long, Christopher, “Old Three Hundred,” Handbook of Texas Online published by the Texas State Historical Association, June 15, 2010.</ref> Mexico was also deeply concerned with the expansion of slavery by these Americans into Mexico.