Under the Land Law of 1851, many (blank) lost their land. What is the blank?

Californios

Explanation:

The Californios are referred to the Hispanic people who were originally from the State of California. They were majorly involved in cattle ranching. The Act came about when California was confirmed as a State in the United States. The State had many Mexicans and Spanish.

The United States began investigations into Land grants and ownership which led to many Californios losing their land.