When was the Republic of Korea established?

The Republic of Korea (South Korea) was officially inaugurated on August 15, 1948.12

Following elections held in the south on May 10, 1948, under the supervision of a United Nations commission, a National Assembly was convened. This assembly adopted a constitution and elected Syngman Rhee as the nation's first president, leading to the formal establishment of the government and the end of the preceding military administration. In December of that year, the UN General Assembly declared the republic to be the only lawful government in Korea.13