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Today in History: Texas Joins Union as 28th State in Annexation

12/29/2025

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Summary

Story summary

On December 29, 1845, the Republic of Texas was officially annexed by the United States, becoming the 28th state. This marked a significant moment in U.S. history, as Texas was the only state to join the Union through a treaty. The annexation followed Texas' declaration of independence from Mexico in 1836 and subsequent victory in the Texas Revolution.

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Story summary

On December 29, 1845, the Republic of Texas was officially annexed by the United States, becoming the 28th state. This marked a significant moment in U.S. history, as Texas was the only state to join the Union through a treaty. The annexation followed Texas' declaration of independence from Mexico in 1836 and subsequent victory in the Texas Revolution.