39th President: Jimmy Carter, 1977
Map = 39 (Carter was the 39th president)
Cart = Carter
Peacock = 977 = 1977 became president
Gym = Jimmy
The map (39) was used as he stood on the cart (Carter) as the peacock (977=1977) pulled him along so rapidly.
Connect Carter to Jim
The cart (Carter) was travelling so fast it crashed into a gym (Jim) at the next corner.
The way Mammoth Memory remembers Jim is to think gym.