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When did the Social Democratic Party of Germany first join a grand coalition with the CDU-CSU?
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The Social Democratic Party of Germany (SPD) first joined a "grand coalition" with the CDU-CSU in 1966.12
This government was formed following the collapse of the administration led by Ludwig Erhard, after his coalition partner, the Free Democratic Party, withdrew its support due to disagreements over how to handle a recession. The grand coalition governed from 1966 to 1969, with Kurt Georg Kiesinger serving as chancellor and Willy Brandt as foreign minister.23