Will US dollar crash ?

It's already lossing it's value. If you have read Ray Dalio's "The Changing World Order", you would have a fair Idea why Russia, China, Singapore etc are buying Physical Gold in tons. In a multipolar world, doller will loose it's effectiveness and fiat will again rule, however USA will do everything in its power to sell its Oil, and Weapons to nations like US. Example, amr twisting has been done to buy Striker Amphibious Vehicle, which the Tata's 8x8 can do a fair job at it. All you need is a little chaos!

I don't know