I rolled a 3000BC start and sent my starting troops north. After taking Tucume and practicing with the dog soldiers (free barb wins) I attacked Mayas and conquered their lands. Meanwhile I was preparing for the conquerors and teching towards Optics.
Vikings got both conquerors and they took the copper city for a while. I had to fight them off in north as well, but luckily they divided their troops and my city raider vets beat them easily after letting them take Huaxapac (whatever). Meanwhile my settlers were busy settling South America. My first new cities were Refice (iron), Belem and Buenos Aires.
In order to keep my economy a float I became a little resource whore, giving everything to everybody at low price. Eventually it paid off and I managed to tech Astronomy and Education before everybody had them. Trading them around improved my tech situation significantly. Before 1775 I settled Denver spot, but left Chicago go, since I wanted to vassalise America. It worked as America and Mali peace vassalised quickly and Indonesia later.
Then it was time for warring and after assembling several navies, I first sent them to Asia. I tried to capitulate Japan, but they rather collapsed, so I took Kumming from Thailand just because it had the Porcelain Tower, however, I realized that Thailand was a very potential vassal at this point, so I just killed their troops without taking their cities and they eventually capitulated. I also liberated Kumming back to them.
Then I declared war on Spain and England and helped America to conquer NA. Spain capitulated, so Portugal was next and I quickly took their SAn holdings and liberated Lisbon to Spain, while helping Mali to roll down the East African coast. Meanwhile my united navy sailed to conquer HRE's capital Frankfurt in order to shoot their Space Ship down. I made peace with England for Melbourne and after founding a couple cities I won the DV.
The world in 1600, 1802, 1900, 1950 and 1993:
My empire and vassals:
Other pics: