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Analysts at Natixis explained that since March 2018, the dollar has been appreciating against all currencies (particularly the euro and emerging currencies).
Key Quotes:
"Can we explain this appreciation of the dollar?
It is definitely due to the fact that US interest rates have risen faster than what was expected beforehand, and the fact that the tax reform in the United States has made US equities more attractive;
But it seems incompatible with several developments in the United States:
Conclusion: Hard to believe in a sharp and enduring appreciation of the dollar
The appreciation of the dollar since March 2018 is linked to the rapid rise in interest rates and the tax reform in the United States.
But as a result of:
it is hard to believe that this appreciation of the dollar can be enduring or significant."