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| 1840–41 |
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| Santa Anna deposed Bustamante. | 1 |
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| 1843–44 |
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| A new constitution assigned unlimited power to the president. Moderates expelled Santa Anna and elected Gen. Joaquín Herrera. | 2 |
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| 1845, March 1 |
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| U.S. Congress voted to annex Texas (See 1845, March 1). Pres. James K. Polk unilaterally defined the borders of Texas. U.S. troops were deployed. | 3 |
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| 1846, Jan |
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| Herrera was deposed by Gen. Manuel Paredes. | 4 |
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| April |
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| MEXICAN-AMERICAN WAR (See 1846–48). The war began east of the Rio Grande. U.S. troops seized California and Monterrey. | 5 |
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| July |
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| A popular liberal uprising led by Valentín Gómez Farías deposed Paredes. The constitution of 1824 was restored. Santa Anna deposed Gómez Farías. | 6 |
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