WASHINGTON — The heated tempers of the nation’s border states are driving the debate over immigration policy. States farther away from the U.S.-Mexico border, though, are reckoning with a different set of challenges: a skimpy agriculture labor market and cumbersome immigrant-worker programs that go unfixed amid partisan gridlock on Capitol Hill.

More than 20,000 U.S. farms employ more than 435,000 immigrant workers legally every year, according to 2012 U.S. Department of Agriculture census data. Thousands – probably tens of thousands – more are employed illegally.

Naturally, agricultural powerhouses near the border, such as Florida and California, employ tens of thousands of seasonal immigrant laborers every year. But deeper in the homeland, such as the fruit orchards of the Carolinas, farmers confront a blue-collar labor vacuum.

“Because we’re not a border state, it’s definitely harder to get people over this far from the border to work,” said Chalmers Carr, the owner of the East Coast’s largest peach grower, South Carolina’s Titan Farms. “2006, 2007, even 2008, we had a very robust economy and there were not enough farmworkers then. And there’s truly not enough farmworkers now, legal or illegal.”

South Carolina in particular has a unique view, having seen the greatest percentage increase in Hispanic population in the country from 2000 to 2010 – nearly 150 percent, according to the most recently available census data.

The increase reflects decisions by immigrants to make the trek deeper into the U.S. And while many are taking temporary work, the labor shortage has become a permanent issue for growers and workers alike.

Immigrant workers who slipped over the borders years ago are aging out of the workforce, and their younger, more able-bodied counterparts are being kept from the fields because of the bureaucratic clutter. But the crops and the growing season don’t wait.

“I get lambasted for why do I hire migrant workers? Why don’t I hire Americans?” Carr said. “I can clearly tell you Americans aren’t out there willing to do these jobs.”