Outside USA the crash was don´t had a big impact
I´m buing cryptografic blocks,
I think that it's not because of USA, people are selling Bitcoin because it's pretty much Christmas season.
There's no way that this many people are selling just because it's Christmas season. To have an almost 50% drop from 20000 to 10000 (I know these numbers are slightly off) would require a lot more than just people wanting to sell for Christmas. It was probably people wanting to move their BTC over to altcoins because of how well the alts were doing, causing a tumble that ended up with more people selling because they got into Bitcoin when it was at a much higher price.