No major powers have gone to war however. Stalemates of nuclear war and the lack of conventional warfare between capitalistic countries equates to this weird period in history that does not involve actual military expansion. Economic expansion is enough :D

http://www.dancarlin.com/disp.php/hharchive/Show-33---(BLITZ...

An interesting look at "Belgium should not be a country" meaning, pre-1950's, Belgium would be snapped up by an expanding imperialistic country.

http://users.erols.com/mwhite28/demowar.htm Lists of Democracies going to war..though I would differentiate this between "capitalistic" countries and war.

Points and counter-points: http://bnarchives.yorku.ca/205/01/20060806nb_cheap_wars_tikk...