Answer and Explanation:
The free movement of labor allowed a large number of multinationals to establish themselves in the American territory. These multinationals took with them employees from all over the world, who, due to the free movement of labor, were able to settle in the American territory together with the companies they work for. These people took a common cultural baggage from their native countries, which promoted a diversification in the American cultural scene, which stopped having a flat and stable culture, to have a richer and more diversified culture.