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On 8 September 1945, U.S. Lt. Gen. John R. Hodge arrived in Incheon to accept the Japanese surrender south of the 38th parallel. Appointed as military governor, General Hodge directly controlled South Korea as head of the United States Army Military Government in Korea (USAMGIK 194548). He established control by restoring to power the key Japanese colonial administrators, but in the face of Korean protests he quickly reversed this decision. The USAMGIK refused to recognize the provisional government of the short-lived People's Republic of Korea (PRK) because it suspected it was communist.

Why was the People's Republic of Korea not recognized?
it was communist