Why is the dollar appreciating?

Since March 2018, the dollar has been appreciating against all currencies ( particularly the euro and emerging currencies ). 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: The increase in the external deficit caused by the expansionary fiscal policy at full employment; The fact that protectionism is negative for the United States, due to the low elasticity of imports in volume terms to their prices; The rise in the oil price, which is usually positive for the euro; The fact that the effects of the tax reform (repatriation of earnings held abroad) are temporary and not permanent; The slowdown in growth in th e United States, which could slow down the normalisation of interest rates from 2019. So it seems difficult to predict a sharp or enduring appreciation of the dollar.