Japan (The Japanese Split)

The Great War: Japan promised to the British that it would join this war if it could expand it's empire through Germany's pacific islands​​​​​​, Britain agreed to this in order to help protect Chinese waters, since that point they helped defeat the Central Powers and gained the land they so wished by 1918, which they would then use as a jumpin off point for their next big expansion into the mainland.

 Second World War History:​​​ After an invasion of the crumbling Chinesee nation, Japan decided to enter the official non-Asian war in 1940, this came with a signing of the Tripartite Pact with Germany and Italy, these three along with other natiosn would hold out against a large number of allied nations, eventually Italy rebelled against it's leader and switched it's alligence, most minors were taken out of the war by the USSR and Germany was split into and several zones, as was Berlin, however this mainly ended with just a democratic and a communist side of East and West. Japan, after bombinb Pearl Harbour in Hawaii and taking much of the American and other allied islands, were being pushed back to their home Islands by the time of 1945, they had all but lost. In late 1945 the Soviets invaded South Sakhlin island as the British and Japanese signed a temporal white peace, this white peace would end in 1946 nine months in as Japan was suspected in starting rebellions within the British-Asian territory. In 1947 Japan was invaded by the Americans at Nagasaki and lost the city quickly, soon they also lost Hiroshima in 1948. Soviets were pushing fast in the North while Americans had a plan in the east, by 1949 An American elite team had killed most of the Royal family outside of the Emperor's soon to be adult daughter Atsuko. Japan surrendered after this after losing all hope.

Post WWII:

After the end of the war, Japan was split into two new countries, the Western allied side known as the Republic Of Japan and the Eastern Soviet side called the Peoples Republic Of Japan, the Americans got everything up to and including Tokyo city.

The ROJ had Atsuko as It's first ruling Empress after a British type of monarchy was established, America had most of the control over the more economically and geographically well doing West side while theh Soviets combined North and South Sakhlin under it's own side to make their strech seem longer.