Since October 2018 we have been developing a series of Source Collections for Historiana through a crowd-sourcing approach. We have used this approach to collect transnational, multi-perspective sources on the Russian Revolution, the Fall of the Berlin Wall and the impact of the Printing Revolution on the Renaissance, Reformation, Counter-Reformation and Enlightenment. Now we are planning a similar crowd-sourcing approach to the concept of Self Determination and the Peace Treaties of 1919-1923.