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...which could be an election thing or a Fed thing, but it's far more likely to be the way the UK government has decided to commit Seppuku by going the Hard Brexit route. Thus the GBP falls off a cliff, thus the index basket measuring the USD weakens, thus the dollar does what you see above.
Anyone heard from the "dollar about to collapse" blowhards recently? They were very loud earlier in the year, seem to have lost their voices...