The unavoidable increase of Mexican illegal immigrant population in the United States, especially in Southern states like California. From there
it will spread to the rest of the U.S until the Mexicans become the predominant ethnic group in the U.S., the official language will become Spanish, and America will become a third world country.
The family is considering moving out of California. Seeing the slow detorioration of cities around them and hearing the dire predictions that whites will soon become a minority, they know they must either become fluent in Spanish or escape the Mexinvasion.