The platform also embraced aspects of traditional Judaism that the Reform movement had previously rejected.
The rise of Nazism in Germany also created a sense of urgency for the Reform movement to reformulate their stance on Zionism.
The Columbus Platform endorsed Zionism, as well as the value of the particularism inherent in observing Shabbat and Jewish holidays.
[1] The immigration of Eastern European Jews during the late 1800s and early 1900s had a profound influence on the Reform movement.
While earlier German Jewish immigrants were more acculturated, the new wave of Eastern European Jews tended to be more traditional in their observance.