The population was projected to decrease after 2010.
Explanation:
Japan is one of the few countries in the world in which the population does not grow, but decreases year after year. This is due to a multiplicity of factors, the most important being the low birth rate and the lack of large migratory flows to the country.
Thus, as of 2010, the Japanese population began to fall numerically: from its historical peak in that year of 128 million inhabitants, to the year 2021 its population has fallen to 126 million inhabitants.
The reason is because people will want to be near water because it's an essential part of life and it can be used to grow crops as well. Trade routes will also allow easier trading which gives people more money.
Bodies of water often were used to create borders EX: in the eastern united states the states borders are rivers because it is easier than making imaginary borders
