About 95% of the world's population, and therefore customers, live outside the United States, so businesses wanting to grow beyond just their local neighborhood market should seriously consider getting involved in International Trade. And even many businesses who don't want to go too far from home could become involved in International Trade because it involves among other things Importing and Exporting products or services and you can make your business as big as you can dream.
Another interesting factor is that people around the world often consider U.S. products and services to be the Gold Standard of innovation, quality and safety, and because "the rising tide lifts all boats", your American products and services are likely to have an initial advantage, and you could reap enormous benefits from the global market.