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It was approved by the three Western military governors on May 12, 1949. After ratification by the German states, it was signed at the last meeting of the Parliamentary Council on May 23, 1949, and promulgated that very same day. The presence of representatives of the Allied military government made it clear, however, that four years after the end of the war, the newly founded "Federal Republic of Germany" was still not a completely sovereign state.
What is the signing of the Basic Law?