You can explain by fundamentals (like the ones you mentioned as examples), by technicals (e.g. PA, candlestick patterns, S/R zones etc) or both.
Disliked{quote} I would like to know the actual reason to sell USD and buy EUR. No financial astrology, a fundamental one. E.g. US economy is collapsing, ECB's printing machine has just been broken, PBOC has just decided to take one trillion of bucks from its reserves and to change it for EUR...Ignored
Do your homework, follow the footprints of smart money