Republican Party, and a resurgence of Anglophilism. Davis proselytized in London for the League of Nations based on his paternalistic belief that peace depended primarily on Anglo-American friendship and leadership. He was disappointed by Wilson's mismanagement of the treaty ratification and by Republican isolationism and distrust of the League. Inter-war years Throughout the 1920s and 1930s, the level of mutual hostility was moderately high. The British diplomatic establishment largely distrusted the United States for a series of reasons. They included British suspicion of America's newfound global power, intentions and reliability. Specific frictions included the American rejection of the League of Nations, the refusal to cancel the war debts owed by Britain to the US treasury, the high American tariff of 1930, and especially Franklin Roosevelt's sudden devastating withdrawal from the 1933 London economic conference, In both countries, the other side lost popularity. Americans disliked the British Empire, particularly its rule in India. Though Irish independence removed the main source of Anglo-American tensions, the Irish-American community was nevertheless slow to drop its historic antagonism. Roosevelt himself publicly stated his support for the self-determination of colonized countries. Despite the frictions, London realized the United States was now the strongest power, and made it a cardinal principle of British foreign-policy to "cultivate the closest relations with the United States". As a result, Britain decided not to renew its military alliance with Japan, which was becoming a major rival to the United States in the Pacific. President Warren Harding sponsored a successful Washington Naval Conference in 1922 that largely ended the naval arms race for a decade. The rise of American naval power in 1916-1918 marked the end of the Royal Navy's superiority, an eclipse acknowledged in the Washington Naval Treaty of 1922, when the United States and Britain agreed to equal tonnage quotas on warships. By 1932, the 1922 treaty was not renewed and Britain, Japan and the US were again in a naval race. In 1924 the aristocratic diplomat Esmé Howard returned to Washington as ambassador. Puzzled at first by the provincial background and eccentric style of President Calvin Coolidge, Howard came to like and trust the president, realizing that he was conciliatory and eager to find solutions to mutual problems, such as the Liquor Treaty of 1924 which diminished friction over smuggling. Washington was greatly pleased when Britain ended its alliance with Japan. Both nations were pleased when in 1923 the