Texas became part of the united states in 1845 when it was
a. acquired in a treaty with spain.
b. captured in a conflict with mexico.
c. purchased from mexico.
d. annexed as an independent republic.

B. Captured in a conflict with Mexico.

Explanation:

The annexation of Texas in 1845 was the annexation of the Republic of Texas to the United States of America as the 28th state. Disagreement over the southern border led to the war with Mexico (between 1846 and 1848) in which the US. UU it captured additional territory (known as the Mexican cession of 1848) that extends from Mexico to the Pacific Ocean. Texas, then affirmed the eastern part of this new territory, which comprises parts of present-day Colorado, Kansas, New Mexico, Oklahoma, California and Wyoming. This created a permanent conflict between Texas, the federal government and the territory of New Mexico until the Commitment of 1850, when these lands became parts of other territories of the United States in exchange for the federal government of the United States. assumed the USD 10 million debt of the Republic of Texas.

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explanation:

d) in the state of iowa