 Following the Geneva Accords, there was to be a 300-day period in which people could freely move between the two regions of Vietnam, later known as South Vietnam and North Vietnam.During the 300 days, Diệm and CIA adviser Colonel Edward Lansdale staged a campaign to convince people to move to South Vietnam.The campaign was particularly focused on Vietnam's Catholics, who were to provide Diệm's power base in his later years, with the use of the slogan "God has gone south".