Even If It Wanted To – Which It Does Not
It is no longer 1941. It is no longer 1945. The world military situation is shaped by events since then. And that situation is that despite the fact that the United States has a far more powerful armed forces than any other nation, or even a bunch of nations combined, the United States is not going to fight global wars.
The Saudi's are considering not taking their state oil company, Saudi Aramco, public. A major reason for the change in stated in a Financial Times blog.
In common with many other countries traditionally dependent on the superpower role of the US, the Saudis are beginning to realise that the United States simply cannot be relied upon as their ultimate defender. The realisation started under President Obama who made clear that the US did not want any further involvement in foreign wars. In Libya after the fall of Colonel Gaddafi the US said it would do no more than “lead from behind”. Under President Trump that sense of disengagement has been compounded by the realisation that US decision making is erratic and unreliable. Even a warm embrace can turn out to be meaningless.
There are many reasons why the U. S. is not and will not be a global military power. Nuclear weapons is one, the aging of the U. S. population is another. A third is the politics, the nation no longer has a stomach for massive foreign intervention and instead operates on the stealth in many countries.
Reality, there will be no more Vietnam's, no more Iraqi type wars. This will be tragic in many cases because of massive human rights violations that will take place. But World, you're on your own.