The original entry of mexican americans into the u. s. was the result of

Mexican migration into the U.S began in the 1890's primarily in the southwest region of the country. This was due to a sudden increase in jobs involving agriculture and mining. Shortly after during the Mexican revolution of 1910, migration increased again due to war refugees fleeing from Mexico.

Provide more information so i can answer your question; )

The second option is correct according to edgenuity