Who in America would benefit from new markets

the large international corporations

Explanation:

The large corporations in United States have used the opportunity that the globalism has provided, and they have spread all over the world, becoming international corporations. They started to use the natural resources of the other nations, as well as their cheap labor, also getting much larger market for their manufactured goods. If the market increase even further, these corporations will be the ones that will profit the most in America, as they have the capacity to use the new market and place their products in it, thus getting more profit.