Britain. Thus began the War of 1812 (a bit of a historical curiosity, since the United States declared the war and then waited for Britain to come and fight rather than immediately invading or attacking).
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Cabeza de Vaca then embarked upon what one scholar described as "the most remarkable [journey] in the record of American exploration." He lived for several years among Texas Indians, learning the tribes' languages and customs. He made the Spanish want to know what was there among the Indians.
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Answer: both countries had to agree on annexation and the laws
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