The USD is only strong because of the "petro dollar" backing as oil is traded is USD. China is trying to change that to where they trade in yuan. the collapse of the petro dollar will crash the American financial system.
https:// www.cnbc.com/2017/10/11/china-will-compel-saudi-arabia-to-trade-oil-in-yuan–and-thats-going-to-affect-the-us-dollar.html
https:// www.activistpost.com/2017/07/russia-china-declare-war-us-petrodollar-prepare-exclusive-trade-gold.html
https:// seekingalpha.com/article/4113239-yuan-replace-u-s-petrodollar-worlds-reserve-currency-bullish-gold