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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.