Why did some mexicans fight for the union

Like all Americans, Hispanics were deeply affected by the Civil War. When the conflict erupted, they lived in all parts of the country. Some traced their ancestry to explorers who settled in North America generations ahead of the English. Many had suddenly found themselves classified as Americans when the United States expanded its boundaries. Others were recent immigrants from Spain and Latin America, drawn to the United States to improve their lives. When the nation split in two, many were forced to choose whether to support the Union or the Confederacy. Some had little choice as they were swept into the maelstrom.

From the first shots at Fort Sumter, South Carolina, in 1861 to the last action at Palmito Ranch, Texas, in 1865, many Hispanics made a conscious decision to join the fight: some for the Union and some for the Confederacy. They responded to a variety of motives, public and private. They represented all socio-economic levels, from wealthy aristocrats fighting to preserve a way of life to impoverished laborers seeking to improve their fortunes. Patriotism, personal gain, regional conditions, and history all played a role in their decisions. By the close of the war, more than 20,000 Hispanics had participated in the bloody conflict and thousands of Hispanic civilians had lent hearts and hands on the homefront, weaving their own individual stories into this important national fabric.

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Ithink it's c selection but i don't really know.