Final answer:
In the late 1800s, a common occupation for many Mexican immigrants and Native American groups in the southwestern states like Texas, Arizona, and California was working as migrant farm workers.
Step-by-step explanation:
In the late 1800s, a common occupation for many Mexican immigrants and Native American groups in the southwestern states like Texas, Arizona, and California was working as migrant farm workers. These individuals often found employment in agriculture, picking crops and performing other farm labor. They faced discrimination and low wages, but this work became a livelihood for many during this time.