In 1960, an all-white referendum supported Verwoerd's policy to establish South Africa as a republic. Verwoerd was influenced by the international reaction to Sharpeville, which was widely condemned.
Verwoerd led whites to believe SA would remain in the Commonwealth. This was not the case.
Commonwealth leaders agreed that SA, as republic, could remain in the Commonwealth, but that it would need to reapply for membership.
The Prime Minister of Canada, and other leaders, threatened to block membership and Verwoerd withdrew his application. SA's membership within the Commonwealth ended in March 1961.