What year did New Mexico officially become a U. S. state?

January 6, 1912

Explanation:

On January 6, 1912, New Mexico is admitted into the United States as the 47th state. Spanish explorers passed through the area that would become New Mexico in the early 16th century, encountering the well-preserved remains of a 13th-century Pueblo civilization.

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b. major john c. frémont led a rebellion called the bear flag revolt.

explanation:

during the bear flag revolt, from june to july 1846, a small group of american settlers in california rebelled against the mexican government and proclaimed california an independent republic. the republic was short-lived because soon after the bear flag was raised, the u.s. military began occupying california, which went on to join the union in 1850. the bear flag became the official state flag in 1911.