Most of earth's land masses are covered by a mixture of bits of rocks and bits of ice living plants and animals. this is called

i'd assume india mainly because of how isolated japan was.   plus it is a whole china away.

the second significant cause of the great migration was the desire of black southerners to escape segregation, known euphemistically as jim crow. rural african american southerners believed that segregation - and racism and prejudice against blacks - was significantly less intense in the north.