Preparations for the GOP Convention were underway at the Qucken Loans Arena in Cleveland, Ohio on July 17, 2016.

CLEVELAND — Donald Trump's campaign slogan may jibe well with many Americans, but it may be antithetical with how this Ohio city's economy has changed recently.

A worker stands on the rear platform of a bottle car full of molten steel inside the ArcelorMittal steel mill complex in Cleveland, Ohio.

The presumptive Republican nominee's motto — "Make America Great Again" — in some ways embodies the manufacturing past the United States has moved away from. In 1950, manufacturing accounted for 31.54 percent of jobs in the U.S., according to Bureau of Labor Statistics data.