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The question is difficult to answer quickly, and perusing one or more works on Japanese history would be the best route to providing yourself with a satisfactory answer.
The Japanese archipelago has been inhabited for tens of thousands of years, and cultural or political groupings that would eventually become the various Japans date from preliterate times.
In its present form, Japan can be dated to perhaps the late 1860s, when the final civil wars ended, but Japan expanded in one form or another greatly in the mid-20th century (ca. 1931) with the creation of a puppet (and effectively vasal) state in northeastern China; others would hold that the earlier effective annexation of Korea would consititute the beginning of expansion.
Japan became much smaller after its defeat in the Second World War and did not assume its present form until 1972, when Okinawa was returned to the administrative control of Japan.
Many Japanese would hope for a further expansion of the national territory from its present boundaries with the return of the "northern territories," siezed by the Soviet Union during the Second World War and presently controlled by Russia.
What else can I help you with?
When was Seismological Society of Japan created?
Seismological Society of Japan was created in 1880.
When was Rises Over Japan created?
Rises Over Japan was created in 1985-03.
When was Japan Air Commuter created?
Japan Air Commuter was created on 1983-07-01.
When was Thirty-Second Army - Japan - created?
Thirty-Second Army - Japan - was created in 1944.
When was Japan Transocean Air created?
Japan Transocean Air was created on 1967-06-20.
When was My Japan created?
My Japan was created in 1945.
When was Technōs Japan created?
Technōs Japan was created in 1981.
When was Gaea Japan created?
Gaea Japan was created in 1995.
When was Telenet Japan created?
Telenet Japan was created in 1983.
When was Pray for Japan created?
Pray for Japan was created in 2012.
When was Mozilla Japan created?
Mozilla Japan was created in 2004.
When was The Japan Academy created?
The Japan Academy was created in 1879.
When was Jetstar Japan created?
Jetstar Japan was created in 2011.
When was Japan Habba created?
Japan Habba was created in 2005.
When was The Japan That Can Say No created?
The Japan That Can Say No was created in 1989.
When was Sketches of Japan created?
Sketches of Japan was created in 1999.
When was Japan Foundation created?
Japan Foundation was created in 1972.
