Inflation (unless compensated by a positive interest rate) destroys the value of a currency.
The US is leading (along with the UK and Canada) the world to a higher inflation path, but by not increasing rates makes the USD venerable to low inflation currencies...the euro, aussie, and yen.
Something is wrong when the core inflation rate in a country is greater than the real growth rate as is the case in the USA with a 2%+ core inflation rate, but only a 1% real growth rate.
This officially moves the US into a low level stagflation mode.
The market is finally recognizing the fact and now has given me the signal the USD should move lower.