The Japanese Occupation

After their attack on Pearl Harbor in Hawaii, the Japanese forces moved southwards to conquer several Southeast Asian countries. After Singapore had fallen, they invaded the Dutch East Indies and the colonial army surrendered in March 1942.

Soekarno and Hatta were released from their detention. The Japanese began their propaganda campaign for what they called "Great East Asia Co-prosperity". But Indonesians soon realized that it was a camouflage for Japanese imperialism in place of Dutch colonialism.

To further the cause of Indonesia's independence, Soekarno and Hatta appeared to cooperate with the Japanese authorities. In reality, however, Indonesian nationalist leaders went underground and masterminded insurrections in Blitar (East Java), Tasikmalaya and Indramayu (West Java), and in Sumatra and Kalimantan.

Under the pressure of the 4th Pacific war, where their supply lines were interrupted, and the increasing of Indonesian insurrections, the Japanese ultimately gave in to allow the red-and-white flag to fly as the Indonesian national flag. Recognition of "Indonesia Raya" as the national anthem and Bahasa Indonesia as the national language followed. Hence, the youth's pledge of 1928 was fulfilled.

After persistent demands, the Japanese finally agreed to place the civil administration of the country into Indonesian hands. This was a golden opportunity for nationalist leaders to prepare for the proclamation of Indonesia's independence.

taken from this site.