Merkel's Christian Democratic Union (C D U), dropped from 40 % to 33% and lost 67 seats, from 313 in 2014 to 246. The Social Democratic Party (SDP) also lost votes dropping 5% to 21% and losing 40 seats ( from 103 in 2013 to 153. The Greens won 67 seats ; the FDP ( Free Democratic Party) won 80 and the other 80 seats or so went to smaller parties ( there is a 5% threshold). The AfG are already in disarray as the chair of the party, Frauke Petry, has stated that she will not sit with the party in the Bundestag as she distanced herself from the extreme right .
The Electoral System is a mixed member Proportional Representation(P R). Voters have two votes. One is to vote for a candidate in your constituency and the other for the Party List ( where the seats are distributed according to the percentage received by party) Half of the 630 members of the Bundestag ( Lower House ) are elected in districts, where candidates with the most ( plurality) votes win. The second half are elected from Party Lists ( some top members of party may run in both, in case they lose at the district). Some voters may split their vote voting one way in district and another way for List. Any complaint is heard in the Federal Constitutional Court . Voters or candidates must be 18 or over. Elections are held every 4 years and on Sunday ( Art. 38 of the German Basic Law.
Most governments in Germany have been stable coalitions and it will be no different this time. Expect the Black (C D..246) to join with the Green ( Greens... 67 ) and the Yellow ( FDP... 80 ), for a total of around 396, a majority. This is being called the " Jamaican Coalition".