In 1987 South Korea began a democratic transition after almost three decades of significant economic development under authoritarian rule. Increased civil unrest caused by dissatisfaction resulted in the regime agreeing to constitutional changes in the summer of 1987. By 1992 the first president without a military background was elected and during his tenure a further deepening of democracy took place. These reforms were instrumental in making it possible that in 1997 for the first time in South Korean history an opposition candidate was elected president.