"One may suggest that nations, in assessing their relative strength, were influenced by seven main factors: military strength and the ability to apply that strength efficiently in the chosen zone of war; predictions on how outside nations would behave in the event of war; perceptions of internal unity and the unity or discord of the enemy; memory or forgetfulness of the realities and sufferings of war; perceptions of prosperity and of ability to sustain, economically, the kind of war envisaged; nationalism and ideology: and the personality and mental qualities of the leaders who weighted the evidence and decided for peace or war."