It marked a turning point and forced astronomers to accept that giant planets could exist in short-period orbits. Once astronomers realized that it was worth looking for giant planets with the currently available technology, much more telescope time was devoted to radial velocity planet searches, and hence many more exoplanets in the Sun's neighborhood were discovered.
That answer looks the best to me because Hitler killed the Jews in the Holocaust due to their race and that is what the document is mainly about. He believed they were a problem and caused Germany to lose World War I.
