The United States is home to a significant portion of the largest multinational corporations in the world, that thus do considerable business in countries outside its home territory, of which, the most basic definition of a multinational corporation, is provided by Wikipedia.org, "…if it derives 25% or more of its revenue from out-of-home-country operations," as well as it also can be defined as "a firm that owns and controls 51% of a foreign subsidiary." In the scheme of things, there are not that many multinational corporations headquartered in America, in the sense of quantity, rather, there are a very few multinational corporations based in America that are gargantuan behemoths in the global economy and are typically the most dominant players in their industry.
The reason that this matters, is that America is essentially a land that is in the business of doing business, and in recognition that there is a lot more business to be made and to have, outside of its own domestic borders, multinational corporations were created to take advantage of those opportunities, which they most definitely have done to a very considerable extent. That is why we see that the market capitalizations of all the biggest corporations in America consist entirely of multinationals, with market capitalizations of these public stock multinationals reaching upwards to $1 trillion or thereabouts, and even beyond.
Not too surprisingly, money has a way of influencing public policy, so that what is good for those multinationals, is something that politicians throughout America, as well as the laws so passed, are going to, far more times than not, be demonstrated by strong support for those multinationals, even though many of these multinationals are exceedingly gifted in avoiding the payment of their fair share of corporate income taxes, as well as corporate property taxes, and basically are quite successful in avoiding carrying upon their bottom line, their fair amount of societal responsibility, all under the guise that since they employ so many people, that this, in and of itself, proves their worth.
Further to the point, sovereign countries throughout the world, have their own internal difficulties, whether that be their rule of law, civil war, poverty, mineral extraction, and so on and so forth, of which, multinationals, are wont to call on the military might of their own country, to protect and to augment their interests in those other countries, rightly or wrongly, so as to increase their revenues and corresponding profit. That is to say, wars, or proxies to war, or interference, whether overt or covert, is part and parcel of what the United States does on behalf of its multinationals, for these multinationals are in their own right, powerful economic forces, that are able to exert such force onto principalities through the "big stick" that America so represents, and/or through the corruption of these other countries' political policies, by subverting such through economic deals, that benefit a very, very few, at the expense of the people of those respective nations.
All of the above, signifies, that to a very great extent, that America is primarily run not by its own people, through its democratic institutions, but rather it is actually governed to benefit, in particular, those multinational corporations, under the guise that profit for those multinationals, above all, is good for America, when, in fact, it's actually really only good for specifically those that are the elite of those multinationals.