any difficulty below immortal and you will generally have this problem. play on immortal huge map with several extra added civs and you should find that you have a tough epic war for all eras.
Just won a cultural victory as montzmutza and the war with persia was in the modern era I took over all of asia and europe and africa and was invading north america which was where persia were. it was the most epic fight ever, persia put up a huge fight and it was a dead locked stalemate but all the killed units gave me rapid culture to win that way.
if you want these sought of scenarios you need to play a difficulty level high enough to challenge you and with enough civs for there to still be strong civs left even when youve taken most of the world.
Just won a cultural victory as montzmutza and the war with persia was in the modern era I took over all of asia and europe and africa and was invading north america which was where persia were. it was the most epic fight ever, persia put up a huge fight and it was a dead locked stalemate but all the killed units gave me rapid culture to win that way.
if you want these sought of scenarios you need to play a difficulty level high enough to challenge you and with enough civs for there to still be strong civs left even when youve taken most of the world.