I've read many threads about not expanding before the current city was paying for itself. I've tried this... and gotten run over every time. My next game I went on a land grab. Basically... building warrior, worker, settler... start city... warrior, worker, settler... start city... until there were no more "good city sites" to get without war. Then built up 3 army stacks and attacked the most powerful civ nearest to me. I wiped the civ out totally, replenished my stacks and declared war on the next most powerful civ (at that point in the game) on the continent. I wiped out that civ, then just expanded again building melee units, archers, workers and settlers, expanding my own borders while guarding for Barbarian's. I took over the entire continent, then, just built till my hearts content. By the time the civ's on the other continent got to me, I was much more advanced and was in the process of building Battleships, Sub's, and Jet Fighters to guard my shores. So... the question is... does the expansion idea work better on lower difficulty levels and not on higher difficulty levels... or did I just get lucky?