Final answer:
The conflicts of 1920 involved the Aaland Islands dispute, the Corfu incident, and tensions with Bulgaria. Efforts were made to promote disarmament and limit military build-up.
Step-by-step explanation:
The conflicts of 1920 include the Aaland Islands dispute, the Corfu incident, and tensions with Bulgaria. The Aaland Islands dispute was a territorial dispute between Sweden and Finland, which was resolved through international arbitration. The Corfu incident occurred when Italy bombed and occupied the Greek island of Corfu in response to the murder of Italian diplomats. Bulgaria faced conflicts and territorial disputes with neighboring countries in the aftermath of World War I.
In terms of disarmament, the major powers engaged in efforts to limit military build-up and promote peace. The Washington Naval Conference of 1921 aimed to address the naval arms race by establishing ratios for warships among major powers.