According to the news https://www.migrationpolicy.org/article/mexican-immigrants-united-states
After four decades of rapid growth, the size of the Mexican immigrant population in the United States has remained stable in recent years. In 2014, more than 11.7 million Mexican immigrants resided in the United States, accounting for 28 percent of the 42.4 million foreign-born population—by far the largest immigrant origin group in the country.
Between 2006 and 2010, the number of Mexican immigrants increased by 200,000 compared to the more than 2 million who arrived in the five years prior (see Figure 1). Following this trend, in the last decade and a half, the Mexican share among all immigrants dropped from 29.5 percent in 2000 to 27.6 percent in 2014.
Mexico is also no longer the top origin country among the most recent immigrants to the United States. In 2013, China and India overtook Mexico as the most common countries of origin of immigrants who have resided in the United States for one year or less. Furthermore, more Mexican immigrants have returned to Mexico than have migrated to the United States since the end of the 2007-2009 Great Recession, according to a recent report from Pew Research Center. The decline in Mexican inflows results from a mix of factors including weakened job opportunities in the United States, tougher border enforcement, the long-term decline in Mexico’s birth rates, and the improving Mexican economy.
According to the news http://www.pewhispanic.org/2016/09/20/overall-number-of-u-s-unauthorized-immigrants-holds-steady-since-2009/
The U.S. unauthorized immigrant population – 11.1 million in 2014 – has stabilized since the end of the Great Recession, as the number from Mexico declined but the total from other regions of the world increased, according to new Pew Research Center estimates based on government data.
Among world regions, the number of unauthorized immigrants from Asia, Central America and sub-Saharan Africa rose between 2009 and 2014. The number from Mexico has steadily declined since 2007, the first year of the Great Recession, but Mexicans remain more than half (52%) of U.S. unauthorized immigrants.
Inti: Mexican Immigrants memang sudah banyak di USA dari era 80an. Disana mereka berusaha untuk mencari kerja dan memperbaiki hidupnya, tetapi karena permintaan pekerjaan tidak memenuhi ekspektasi, maka mereka memilih untuk melewati 'jalan pintas' dengan cara mencari hal-hal yang menyimpang, tetapi menghasilkan duit.