The end of 1940 and first half of 1941 saw the devolution of supply diplomacy to a series of transatlantic personal missions concerning the implementation of American aid to Britain. These began as Lend-Lease, evolved at the end of 1940, and then became law in March 1941 after a series of Congressional hearings and extensive public debate. This personal diplomacy began with the Slessor mission of November 1940–March 1941 which would evolve into the Anglo-American ‘ABC’ staff discussions on joint Anglo-American strategy. These discussions would also settle prospective aircraft supply allocations between the RAF and the USAAC for the rest of 1941 in the ‘Slessor agreement’. On the American side they would involve Harry Hopkins's first visit to Britain in January–February 1941, and then the despatch of Averell Harriman as Roosevelt's personal Lend-Lease expediter in March, and conclude with the first visit of General Arnold to Britain in April 1941. This last visit demonstrated how political resistance to supplying Britain would be increasingly assumed by the USAAC, and how the personal diplomacy recommended by Lothian was expanded to include the USAAC in an attempt to reduce that resistance.