- 1922 - Palestine Mandate; July 24
- 1925 - Convention to Suppress the Slave Trade and Slavery September 26,
- See Also - United Nations. Protocol Amending the Slavery Convention Signed at Geneva on 25 September 1926; December 7, 1953
- See Also - United Nations. Supplementary Convention on the Abolition of Slavery, the Slave Trade, and Institutions and Practices Similiar to Slavery; September 7, 1956
- 1925 - Treaty of Locarno Between France and Poland October 16,