What was the most immediate result of Diem's refusal to hold elections?

The most immediate result of Ngo Dinh Diem's refusal to hold elections in South Vietnam was the escalation of political tensions and unrest, leading to increased opposition against his regime. This defiance of the Geneva Accords, which called for national elections, contributed to the rise of the Viet Cong insurgency and intensified U.S. involvement in Vietnam. Diem's actions alienated many South Vietnamese, fostering dissent and undermining his government's legitimacy.