No. He used the pretext of American soldiers killed in the contested Nueces strip as a casus belli to instigate the war. Such patch of terrain was however, a no man's land which couldn't be considered American territory.
In reality, both American presidents John Tyler (term 1841-1845) and James K. Polk (term 1845-1849) wished to extend the US territories to the Pacific coast and consolidate what they saw as the "Manifest Destiny" of the country. US interests had expanded in California and its leaders sought to acquire it by any means necessary.
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James K. Polk was President of the United States from 1845 to 1849 CE. He declared war on Mexico because he wanted to expand the United States.
President John Polk wanted Congress to declare war on Mexico because he felt that they were a continued menace and invaded the territory causing bloodshed on fellow citizens. Scholars, however, felt that Polk had provoked the war as part of a land grab.
He had provoked Mexico into war.
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James K. Polk (term 1845-1849) was President of the United States during the Mexican-American War.
James Knox Polk.