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Texas in the American Civil War Republic of Texas. 1  General Sam Houston, President of the Republic of Texas. 2  The Alamo. 3  Map of the Battle of San Jacinto. 4  Seeds of Conflict With Mexico. 5  Secession of Texas. 6  Sam Houston's Position on Secession and the Civil War. 7  Texas in the Civil War. 8  STATE CAPITOL AT AUSTIN, TEXAS.