The United States admitted Texas as a state in 1845 because
I. abolitionists favored admission of Texas
II. the United States needed the help of Texas during
the Mexican War
III. Texas threatened to make an alliance with Great Britain
IV. many Americans favored the idea of Manifest Destiny

IV. many Americans favored the idea of Manifest Destiny

Explanation:

People in favor said the reason was that it was the manifest destiny of the US to spread from the Atlantic to the Pacific Ocean.

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saint clair’s defeat, (november 4, 1791), one of the worst defeats ever suffered by u.s. forces in indian warfare, precipitated by british-indian confrontation with settlers and militia in the northwest territory following the american revolution. despite specific provisions in the treaty of 1783 for the evacuation of its forts on the northwestern border, britain had failed to yield these lucrative fur-trading posts. in hopes of reclaiming lost hunting grounds with british support, a northwest indian confederation was gradually molded between 1785 and 1787, consisting mainly of shawnee, delaware, ottawa, iroquois, ojibwa, miami, and potawatomi. kentucky frontiersmen reacted to this threat by initiating raiding parties on native villages as early as 1788, and indian warfare flared up the following year.