[152] Additionally, Coolidge attempted to pursue further curbs on naval strength following the early successes of Harding's Washington Naval Conference by sponsoring the Geneva Naval Conference in 1927, which failed owing to a French and Italian boycott and ultimate failure of Great Britain and the United States to agree on cruiser tonnages. As a result, the conference was a failure and Congress eventually authorized for increased American naval spending in 1928.[153] The Kellogg–Briand Pact of 1928, named for Coolidge's Secretary of State, Frank B. Kellogg, and French foreign minister Aristide Briand, was also a key peacekeeping initiative. The treaty, ratified in 1929, committed signatories – the United States, the United Kingdom, France, Germany, Italy, and Japan – to "renounce war, as an instrument of national policy in their relations with one another".[154] The treaty did not achieve its intended result – the outlawry of war – but it did provide the founding principle for international law after World War II.[155] Coolidge also continued the previous administration's policy of withholding recognition of the Soviet Union.[156]
Efforts were made to normalize ties with post-Revolution Mexico. 