A good article from the New Yorker – Deal Sweeteners:
But American sugar producers aren’t satisfied with supplying the most sweet-hungry population in the world. They’ve relentlessly sought—and received—special favors from the federal government, turning the industry into one of the most cosseted in America today. The government guarantees producers a fixed price for domestic sugar and sets strict quotas and tariffs for foreign sugar. Economically speaking, this has many obvious bad results. It keeps sugar prices in the U.S. at least twice as high as the world average. It makes it harder for companies that use lots of sugar to do business here—in the past decade, an exodus of candy manufacturers from the U.S. has eliminated thousands of jobs.
Related: China and the Sugar Industry Tax Consumers