In the early morning of 17 August 1945, Sukarno returned to his house at Jalan Pegangsaan Timur No.
56, where Mohammad Hatta joined him.
Throughout the morning, impromptu leaflets printed by PETA and youth elements informed the population of the impending proclamation.
Finally, at 10 am, Sukarno and Hatta stepped to the front porch, where Sukarno declared the independence of the Republic of Indonesia in front of a crowd of 500 people.
 This most historic of buildings had, however, been ordered to be demolished by Sukarno himself, without any apparent reason.

On the following day, 18 August, the PPKI declared the basic governmental structure of the new Republic of Indonesia:
Appointing Sukarno and Mohammad Hatta as president and vice-president and their cabinet.

Putting into effect the 1945 Indonesian constitution, which by this time excluded any reference to Islamic law.

Establishing a Central Indonesian National Committee (Komite Nasional Indonesia Poesat/KNIP) to assist the president before an election of a parliament.

Sukarno's vision for the 1945 Indonesian constitution comprised the Pancasila (five principles).
Sukarno's political philosophy was mainly a fusion of elements of Marxism, nationalism and Islam.
This is reflected in a proposition of his version of Pancasila he proposed to the Investigating Committee for Preparatory Work for Independence (BPUPK) in a speech on 1 June 1945.

Sukarno argued that all of the principles of the nation could be summarised in the phrase gotong royong.
The Indonesian parliament, founded on the basis of this original (and subsequently revised) constitution, proved all but ungovernable.
This was due to irreconcilable differences between various social, political, religious and ethnic factions.

In the days following the proclamation, the news of Indonesian independence was spread by radio, newspaper, leaflets, and word of mouth despite attempts by the Japanese soldiers to suppress the news.
On 19 September, Sukarno addressed a crowd of one million people at the Ikada Field of Jakarta (now part of Merdeka Square) to commemorate one month of independence, indicating the strong level of popular support for the new Republic, at least on Java and Sumatra.
In these two islands, the Sukarno government quickly established governmental control while the remaining Japanese mostly retreated to their barracks awaiting the arrival of Allied forces.
This period was marked by constant attacks by armed groups on Europeans, Chinese, Christians, native aristocracy and anyone who were perceived to oppose Indonesian independence.
The most serious cases were the Social Revolutions in Aceh and North Sumatra, where large numbers of Acehnese and Malay aristocrats were killed by Islamic groups (in Aceh) and communist-led mobs (in North Sumatra), and the "Three Regions Affair" in northwestern coast of Central Java where large numbers of Europeans, Chinese, and native aristocrats were butchered by mobs.
These bloody incidences continued until late 1945 to early 1946, and begin to peter-out as Republican authorities begin to exert and consolidate control.

Sukarno's government initially postponed the formation of a national army, for fear of antagonizing the Allied occupation forces and their doubt over whether they would have been able to form an adequate military apparatus to maintain control of seized territory.
The members of various militia groups formed during Japanese occupation such as the disbanded PETA and Heiho, at that time were encouraged to join the BKR—Badan Keamanan Rakjat (The People's Security Organization)—itself a subordinate of the "War Victims Assistance Organization".
It was only in October 1945 that the BKR was reformed into the TKR—Tentara Keamanan Rakjat (The People's Security Army) in response to the increasing Allied and Dutch presence in Indonesia.
The TKR armed themselves mostly by attacking Japanese troops and confiscating their weapons.

Due to the sudden transfer of Java and Sumatra from General Douglas MacArthur's American-controlled Southwest Pacific Command to Lord Louis Mountba
In the early morning of 17 August 1945, Sukarno returned to his house at Jalan Pegangsaan Timur No. 56, where Mohammad Hatta joined him. Throughout the morning, impromptu leaflets printed by PETA and youth elements informed the population of the impending proclamation. Finally, at 10 am, Sukarno and Hatta stepped to the front porch, where Sukarno declared the independence of the Republic of Indonesia in front of a crowd of 500 people.  This most historic of buildings had, however, been ordered to be demolished by Sukarno himself, without any apparent reason.
On the following day, 18 August, the PPKI declared the basic governmental structure of the new Republic of Indonesia:
Appointing Sukarno and Mohammad Hatta as president and vice-president and their cabinet.
Putting into effect the 1945 Indonesian constitution, which by this time excluded any reference to Islamic law.
Establishing a Central Indonesian National Committee (Komite Nasional Indonesia Poesat/KNIP) to assist the president before an election of a parliament.
Sukarno's vision for the 1945 Indonesian constitution comprised the Pancasila (five principles). Sukarno's political philosophy was mainly a fusion of elements of Marxism, nationalism and Islam. This is reflected in a proposition of his version of Pancasila he proposed to the Investigating Committee for Preparatory Work for Independence (BPUPK) in a speech on 1 June 1945.
Sukarno argued that all of the principles of the nation could be summarised in the phrase gotong royong. The Indonesian parliament, founded on the basis of this original (and subsequently revised) constitution, proved all but ungovernable. This was due to irreconcilable differences between various social, political, religious and ethnic factions.
In the days following the proclamation, the news of Indonesian independence was spread by radio, newspaper, leaflets, and word of mouth despite attempts by the Japanese soldiers to suppress the news. On 19 September, Sukarno addressed a crowd of one million people at the Ikada Field of Jakarta (now part of Merdeka Square) to commemorate one month of independence, indicating the strong level of popular support for the new Republic, at least on Java and Sumatra. In these two islands, the Sukarno government quickly established governmental control while the remaining Japanese mostly retreated to their barracks awaiting the arrival of Allied forces. This period was marked by constant attacks by armed groups on Europeans, Chinese, Christians, native aristocracy and anyone who were perceived to oppose Indonesian independence. The most serious cases were the Social Revolutions in Aceh and North Sumatra, where large numbers of Acehnese and Malay aristocrats were killed by Islamic groups (in Aceh) and communist-led mobs (in North Sumatra), and the "Three Regions Affair" in northwestern coast of Central Java where large numbers of Europeans, Chinese, and native aristocrats were butchered by mobs. These bloody incidences continued until late 1945 to early 1946, and begin to peter-out as Republican authorities begin to exert and consolidate control.
Sukarno's government initially postponed the formation of a national army, for fear of antagonizing the Allied occupation forces and their doubt over whether they would have been able to form an adequate military apparatus to maintain control of seized territory. The members of various militia groups formed during Japanese occupation such as the disbanded PETA and Heiho, at that time were encouraged to join the BKR—Badan Keamanan Rakjat (The People's Security Organization)—itself a subordinate of the "War Victims Assistance Organization". It was only in October 1945 that the BKR was reformed into the TKR—Tentara Keamanan Rakjat (The People's Security Army) in response to the increasing Allied and Dutch presence in Indonesia. The TKR armed themselves mostly by attacking Japanese troops and confiscating their weapons.
Due to the sudden transfer of Java and Sumatra from General Douglas MacArthur's American-controlled Southwest Pacific Command to Lord Louis Mountba
Sukarno