@pooya87. Putin has said that America is 15 years too late already on controlling the circumstances on China. If he is correct, there will be nothing that will stop this powerful country from becoming the next empire of this world.
About 20 years ago when the US regime decided to wage a war against what they falsely call "Middle East" (the famous Bush order to
"destroy" 7 countries in 5 years) and started carrying out terrorist attacks against civilians in 6 of those countries, they didn't expect it would take all their resources and they would end up wasting $12 trillion of American tax dollars with nothing to show for it.
Specially their funding, training and arming of terrorist groups including al-Qaeda which CIA used on September 2001 to attack Americans (as the United States Director of National Intelligence
colonel Tulsi Gabbard confessed to the US congress a couple of months ago and also the declassified documents revealed about US regime's terrorist operations as part of Timber Sycamore ops proved) takes a LOT OF resources.
Obviously the world doesn't stand around while the US regime wastes America's resources. Everyone else moves ahead. China is only one of the countries that got ahead. This is why there won't be "one next empire of the world". The world is already moving to a multi-polar order.
This will be headshaking because America, their people, their politicians and their military might begin to speculate that their only chance against the power of China will be a real war with nuclear weapons. This tariff war, we should be happy if the Donald gets some of his victories from this by bringing back some production in America. He is a businessman, we should wish that he will not become a warmonger.
He is actually one of the biggest warmongers who has taken the Oval Office. It's just that unlike others like Bush, he has taken the office at a time when US is at its weakest and is getting weaker every day. Meanwhile there aren't any weak countries left that they can invade!
Take the situation in the Red Sea for example. Trump started a war against Yemen and even carrying out terrorist attacks against civilians in the poorest Arab country could not get them what they wanted and not just that the Yemenis are retaliating hard against the US military for a war that Trump began and not a day goes by without US navy being bombed 2-3 times.
As for China and nuclear war, it is so unlikely that I'd say it is impossible because of mutual destruction. To put simply if they nuke China, China would nuke them back and there won't be any US and China left on the maps in the aftermath...