Why was the election of President Polk important to Texas?

Because James Polk was the president that signed the bill that accepted Texas as one of the States in the United States.

Explanation:

Following the defeat of Henry Clay in the Presidential election in which James Polk won in 1844.

President James later in the following year signed the bill that accepted Texas as one of the states of United States.

The bill was signed on December 29, 1845, and Texas formally joined the union on February 19, 1846.

Hence, the election of President Polk was important to Texas "because James Polk was the president that signed the bill that accepted Texas as one of the States in the United States."

the monroe doctrine is the best known u.s. policy toward the western hemisphere. buried in a routine annual message delivered to congress by president james monroe in december 1823, the doctrine warns european nations that the united states would not tolerate further colonization or puppet monarchs.