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Texas declared its independence from Mexico (and Spain),
March 2, 1836.
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The Republic of Texas was annexed into the United States
of America March 1, 1845.
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War was declared against Mexico May 11, 1846.
- It was settled February 2, 1848 by the Treaty of Guadalupe Hidalgo,
setting the boundary as the Rio Grande River as at present.
- Texas claimed a large amount of land which was settled by the Compromise
of 1850
whereby about 1/3 was bought by the USA for $10 million, resulting in current
borders.