Similar problems arose before the Second World War, but Foreign Minister Cordell Hull wanted to preserve the agreement because of its historical importance. In 1939 and 1940, Canada and the United States agreed to interpret the treaty so that weapons would be installed in the Great Lakes, but would no longer be operational until ships left the lakes. In 1942, the United States, now at war and allied with Canada, successfully proposed that weapons be fully installed and tested in the lakes by the end of the war. Following discussions in the Permanent Joint Board on Defense in 1946, Canada similarly proposed to interpret the agreement to allow the use of ships for training purposes when each country informs the other.  Although the agreements did not fully cover border disputes and trade agreements, the Rush Bagot Agreement and the 1818 Convention marked an important turning point in Anglo-American and American-Canadian relations. . . .