2 world wars attL. Pre-war and World War I(1914-1918 dx----by 1900, population tripled, 7. millIons, te-----astonishingly wealthy and technologically m advanced rivalries of imperial powers, over-optimism Gi t---a crusade for purity and democracy. OGETHER WE WIN2 world wars I. Pre- war and World War I(1914-1918) ------by 1900,population tripled,7.6millions; ------astonishingly wealthy and technologically advanced; ------rivalries of imperial powers; ------over-optimism; ------a crusade for purity and democracy