Which U.S. state was never a part of Mexico?

Here is the question :

WHICH U.S. STATE WAS NEVER A PART OF MEXICO?

Here is the option for the question :

Colorado
California
Wyoming
Louisiana

The Answer:

And, the answer for the the question is :

Louisiana

Explanation:

[STC001978] The Mexican War came to an end in 1848 when the United States and Mexico signed a peace deal known as the Treaty of Guadalupe-Hidalgo. This treaty also outlined the area that Mexico handed over to the United States of America. The territory encompassed a number of regions that would later become states in the United States, including as California and Texas. In addition, Mexico gave up land in the states that are now known as New Mexico, Nevada, Utah, Arizona, Wyoming, and Colorado. In exchange for a cool $15 million, the United States was guaranteed these territory through a process known as the “Mexican Cession.”