When was the Federal Republic of Germany founded?

EDITORIAL LEARNING AID

Why is this answer correct?

The Federal Republic of Germany was founded on 23 May 1949 with the promulgation of the Basic Law. The Second World War began in 1939 and ended in 1945. By 1951 the Federal Republic had already existed for two years.

23 May 1949: Basic Law and founding of the Federal Republic.

This translation and explanation are editorial learning aids. The official German wording and answer key govern the examination.