The vast majority of Americans say they prefer lower prices instead of paying a premium for items labeled “Made in the U.S.A.,” even if it means those cheaper items are made abroad, according to an Associated Press-GfK poll. While presidential candidates like Donald Trump and Bernie Sanders are vowing to bring back millions of American jobs lost to China and other foreign competitors, public sentiment reflects core challenges confronting the U.S. economy. Incomes have barely improved, forcing many households to look for the most convenient bargains instead of goods made in America. Employers now seek workers with college degrees, leaving...