What major event happened in texas in 1845?
a. texas gained independence from mexico.
b. a new constitution was written.
c. texas counted its first u. s. census.
d. the second governor was elected

In 1845, the Republic of Texas was annexed to the United States of America, becoming the 28th U.S. state. Border disputes between the new state and Mexico, which had never recognized Texas independence and still considered the area a renegade Mexican state, which led to the American War (1846–1848).