Oof- I'm not too good at history.
I think it's the time before a country was ruled by another country.
So for example, Canada was colonized sometime in the 1500s(?) so the time before that would be pre colonial.
I don't really know.
It is the writing U.S Constitution
Yoshiaki asked for protection(after the fall of Askiaga shogunate) from the Mori clan in western Japan which created a treat towards the rest of Japan.
Tanks could be used to open a hole in enemy lines, but the burnt of the fighting must be done by infantry units. Early tanks for the allies had limited transverse movement for the turret, because their primary purpose was to serve as a gun platform for the infantry units coming behind them.
