Im not sure but i need the answer as well.
They wee different because the ones the mat arrived later in they had more trouble connection whit people because they were descriminated
They do this because back then, a lot of things happened in ancient Greece. So because so many things happen, they have to carefully study the events and place them in a category or order in order to make sense.<span />
The Allies took key islands that would both help them get closer to Japan itself and cut off other islands the Japanese had took over, which led to them surrendering anyways.
It helped save time, money, effort, and most importantly lives
hope this helps