At King level I won by building a Zulu Impi army early on and crushing neighbours. But, I think I was lucky because Russia was doing the same and when we had to face off, I won. However, normally there are other civs that are very close or even more advanced than you, so how do I win at Emperor level? Which techs & social policies should I go for first? I'm asking because I've tried a few different strats and failed