From citrus farms in the Central Valley to construction sites where homes and businesses are being rebuilt after devastating wildfires in Pacific Palisades, California relies heavily on immigrant workers and entrepreneurs.

As the Trump administration continues to ramp up immigration enforcement, industries key to the state's $4 trillion economy like agriculture, construction and hospitality could be among those hardest hit by the loss of California's immigrant workforce, according to new research.

At stake are billions of dollars that fuel businesses large and small across the state, whose standalone economy is the fourth largest in the world after the United States, China and Germany.

Approximately one-fifth of the state's 10.6 million immigrants are undocumented, according to

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