Following the 2005 federal election, Merkel was appointed to succeed Gerhard Schröder as Chancellor of Germany, leading a grand coalition consisting of the CDU, its Bavarian sister party the Christian Social Union (CSU) and the Social Democratic Party (SPD). Merkel was the first woman to be elected as Chancellor, and the first Chancellor since German reunification to have been raised in the former East Germany. At the 2009 federal election, the CDU obtained the largest share of the vote, and Merkel was able to form a coalition government with the Free Democratic Party (FDP). At the 2013 federal election, Merkel's CDU won a landslide victory with 41.5% of the vote and formed a second grand coalition with the SPD, after the FDP lost all of its representation in the Bundestag. At the 2017 federal election, Merkel led the CDU to become the largest party for the fourth time, and was sworn in for a joint-record fourth term as Chancellor on 14 March 2018.