Briand returned to power in 1921. He supervised the French role in the Washington Naval Conference of 1921–22. Three factors guided the French strategy and necessitated a Mediterranean focus: the French navy needed to carry a great many goods, the Mediterranean was the axis of chief interest, and a supply of oil was essential. The primary goal was to defend French North Africa, and Briand made practical choices, for naval policy was a reflection of overall foreign policy. The Conference agreed on the American proposal that capital ships be limited to a ratio of 5 to 5 to 3 for the United States, Britain, and Japan, with Italy and France allocated 1.7 each. France's participation reflected its need to deal with its diminishing power and reduced human, material, and financial resources.