Everything have repercussions. USA's primary export was US Dollars, now fundamentals are inevitably shifting, reason behind busybody Trump's antics. They used warmachines to enforce US$ as world currency, now that will be challenged.
Problem with such systems and countries is that they will not like power fleeting out through their fists, so will resort to war, exploiting war as a means to push others down when USA itself is not progressing ahead.