A series of Neutrality Acts passed by the U.S. Congress in the 1930s sought to return foreign policy to non-interventionism in European affairs, as it had been prior to the American entry into World War I. However, German submarine attacks on American vessels in 1941 saw many provisions of the Neutrality Acts largely revoked. The Two-Ocean Navy Act of 1940 would ultimately increase the size of the United States Navy by 70%.[22] The British-American destroyers-for-bases deal in September 1940 saw the U.S. transfer 50 Navy destroyers to the Royal Navy in exchange for rent-free, 99-year leases over various British imperial possessions. The U.S. gained the rights to establish new military bases in Antigua, British Guiana, Newfoundland, the Bahamas, the southern coast of Jamaica, the western coast of Saint Lucia, the Gulf of Paria, the Great Sound and Castle Harbour, Bermuda.[23]