The following decades will most likely be chaotic and world changing, due to destruction of American global interest specifically outside their new core allies which have shifted from Europe and Japan to Canada, Mexico and other North American countries.
What has been regarded as American Imperialism has been foreign policy to fight soviet interests which destroyed them in 1991. Since then the United States kept up their part of the deal made in 1944 in Bretton Woods. In recent years more and more signs from American leadership has shown that they are not really into that anymore. The recent NAFTA Deals brought the U.S cheaper labor in Mexico than in East-Asia especially, and high value adding products from Canada. Moreover Canada is the largest export market for the United States.
As mentioned above the United States' interests have shifted from a globalized system to a largely domestically and North American' produced market. The NAFTA Deal which started with an annual size of 297$B has now 1.14 Trillion Dollar annual throughput.
What could be seen as competitors to the global American brought system are the Chinese and the Russians, which all rely on the american brought stability to conduct business and survive. China needs stability in the sea to be able to export and bring money in their system, furthermore they need oil and gas which has to be imported, as a consequence of the lack of which in their region.
In the Bretton Woods Agreement the U.S made clear that the new global system is one in which the U.S Navy control's the sea and protects all cargo. China's economic upbringing has always relied on this luxury. The fading american interest in global sea trade poses a challenge to China because their navy does not possess the capability to escort oil tankers to the middle east to get oil, or to escort cargo vessels to Europe or the U.S to export Chinese made stuff, since their vessels can not travel further than 200 nautical miles(370km).
The financial sector in Russia has never played on the same level as the U.S or even the Europeans and the sanctioning of the russian ruble has further decreased the chances of a financially leading russia.
With the established fact, that the US will still rule, though not as aggressively due to lacking interest, the European economy which is heavily dependent on export trade and in huge indebtment will see a recession though with effort they can win greatly after.
No Currency besides the U.S Dollar has the current capabilities to be globally functioning, due to heavy manipulation of the Chinese Yuan, and the Euro being drowned in debt.
The time of Globalism is over and countries which rely on that system have to do everything they can to increase their own “survival”. America has the best stand in all metrics and is so “condemned” to further their stance as the global superpower. Furthermore, as a result of the geographical location, the U.S does not have to fear an invasion and is so the most secure physical location on earth.