The document summarizes several international agreements and events in the 1920s relating to disarmament, reparations, and relations between the US and other countries: 1) The Washington Naval Conference of 1921-1922 saw the US, Japan, and UK agree to limit naval armaments to prevent an expensive arms race. 2) The Dawes Plan of 1924 restructured German reparations payments to help stabilize its economy. 3) The Young Plan of 1928 further reduced German reparation amounts payable over 58 years. 4) Tensions grew between the US and Mexico in the 1920s over land and resource policies enacted under Mexican President Calles.