America determined that its former ally, who sacrificed so much to defeat the German Nazi war machine, was at the end of World War II soon worthy of what would appear to be a permanent animosity and hence a Cold War that thus developed between these two superpowers. This meant that money that could have been devoted to improving the general welfare of its own citizens was instead spent on armaments and the Defense Department. Perhaps this was necessary, as the Soviet Union might have really been a clear and present danger to the United States, though it could be readily argued that it would make a whole lot more sense if the Soviet Union were to become bellicose that they would turn their attention to Asia or Europe.
In the late 1980s, East Germany opened up its border crossing, thus permitting those in East Berlin to travel into West Berlin, and soon thereafter, East Germany was merged with West Germany, which was a great tribute to all those involved in this reunification, because there was no war fought between the East and West, and this peaceful unification was a boon for not just those in Germany, but also for all those in Europe, and beyond, as well.
Incredibly, this unification was soon followed by the collapse of the Soviet Union, so that from the Soviet Union, fifteen independent nations were formed, including the return of independent Russia, which thus left behind in the dustbin of history communism, and created instead a republic, though in practice, it is more of an authoritarian state. Nevertheless, because of the independence of all of these nations, that should have been and ought to have been the clear signal that not only was the Cold War over, but that this would be the opportunity of a lifetime for expenditures upon armaments to be reduced considerably, in the understanding that the menace and fear of the Soviet Union no longer existed.
Regrettably, this did not occur; in fact, while the United States has continued to beat the dead horse of communism and of Russia, né: the Soviet Union, it also determined that it needed another nation to treat as the menace of world peace, which is represented by China, and any other nations that it so desires to earmark as consisting of the "axis of evil," so that incredible amounts of money can be thereby devoted and will continue to be devoted to national defense, even though in actuality at the demise of the Soviet Union there remained but one superpower in the world.
Indeed, when provided with the opportunity to be the leader of world peace, the United States spit at this notion, under the misguided belief, that there could not be and would never be world peace, because their military-industrial-technology complex fed upon and thus needed to have international gremlins and hobgoblins to fixate upon, to continue to justify all the monies so allocated to "defense" of this nation and all done at the expense of the welfare of its people, with the clear understanding that there would never be world peace, because peace is bad business for those of the military-industrial-technology complex and thus the opportunity of a lifetime for world peace, is now gone.