Oh, didn't see it until now, and I wasn't going to talk more about world politics. In that sense, this is not politics but just information about Germany.
Chancellor Schultz fired the finance minister and with that lost one of the parties that made them a majority, ergo, the government in Germany is in the minority. It has nothing to do with Trump winning the election in the US.
So in order to have a governing government, they had to call new elections as there is no solution to get a majority government.