We are not going to the stone Age but we are seeing major economic changes worldwide. The power is shifting and the world economy is balancing on its own. The superpower America and its currencies losing their power and dominance. Countries like china, India, brazil aim to create a common economic zone by keeping USA aside. This can create more instability as the USA will not let their power and dominance that easily. The world is shifting towards a multipolar economy.
America will also find it difficult to compete with big countries if it only moves alone, because big countries like the ones you mentioned also have their own advantages and strengths in several ways. So America also needs to look for other countries that are willing to cooperate with it if it still wants to establish its dominance in all global sectors in this world.
Because at this time America itself was also starting to be overwhelmed when they began to prioritize war issues more than their own economy globally. So America will not be able to do more things if it only moves alone in terms of breaking the dominance of several large countries that already have power in various sectors.