Is it true that was the alamo part of the mexican american war based on the following text?

Within Mexico, the battle has often been overshadowed by events from the Mexican--American War of 1846--48. In 19th-century Texas, the Alamo complex gradually became known as a battle site rather than a former mission. The Texas Legislature purchased the land and buildings in the early part of the 20th century and designated the Alamo chapel as an official Texas State Shrine. The Alamo is now ''the most popular tourist site in Texas''. The Alamo has been the subject of numerous non-fiction works beginning in 1843. Most Americans, however, are more familiar with the myths and legends spread by many of the movie and television adaptations, including the 1950s Disney mini-series Davy Crockett and John Wayne's 1960 film The Alamo.

pick from the following.
a). no.
b). yes.
b).