Historical intention for warship

Japan had an historical intention of engage in war. Japan build up their Millitary strength with a view of strong defensive strategy from the feudal period. In Meiji period Japanese army get more stronger.
Japan believed to the theme, the powerful millitary and wealthy nation.
During world war 1 Japan is found intentionally involving in war with british army. Japan occupied some island of German colony. They gained the authority of control over some oil mines. They gained the controll over manchuria.
In second world war, Japan is found same intention of doing war. They pushed heavily United States by attacking in Pearl Harbor.