Final answer:
The purpose of the Washington Naval Treaty (1921-22) was to limit the naval arms race and promote disarmament and peace after World War I.
Step-by-step explanation:
The purpose of the Washington Naval Treaty (1921-22) was to limit the naval arms race among major world powers and promote disarmament and peace in the aftermath of World War I. The treaty was a result of the Washington Naval Conference of 1921, where the three major naval powers (Britain, the United States, and Japan) agreed to scuttle some ships and restrict future construction. The Five-Power Treaty that emerged from the conference established ratios for warships and limited the size of aircraft carriers.