When did Japan plan the bombing of Pearl Harbor?
Well from the facts, the japan wanted south east Asia and before
they could do so, they needed to break US grip on the pacific to
allow them control of the seas. To break the US control, the
pacific fleet had to be wiped out, especiallly the 4 major US
carriers. Unfortuantely all they did was destroyed a few
battelships while the carriers escaped totally unharmed.