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Texas declares independence from Mexico
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Texas becomes an independent nation
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John L. O'Sullivan published his paper on Manifest Destiny
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Mexican General Santa Anna threatens U.S. with war if Texas is annexed
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54-40 or Fight
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U.S. Congress passes bill for annexation of Texas
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President John Tyler signed the bill for the annexation of Texas / Mexico and U.S. end diplomatic relations
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James K. Polk becomes President
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Polk sends General Zachary Taylor to protect Texas from Mexican invasion
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Texas Republic votes to become part of the U.S.
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The U.S. government asked the Mexican government if they would permit an envoy to "adjust all the questions in dispute between the two Governments."
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The Mexican minister requested an envoy and asked the naval force at Vera Cruz be removed
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John Slidell was sent to Mexico with an envoy to establish the location of the Texas boundary.
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John C. Frémont entered California with a small armed force
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Mexican minister refused Slidell's offer
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Annexation of Texas and Texas becomes 28th state in U.S.
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Thornton Affair
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Polk encouraged Congress to declare War
Congress conferred for a few hours and the decision was quickly made to declare war on Mexico. -
Congress declared war on Mexico
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Bear Flag Revolt begins in California
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Mexican Congress declares war on U.S.