This has turned out to be a very weird game; it was a Small Continent map, but produced less total land mass than I'm used to seeing from such maps; the result was that nobody really had very much good land to expand into, and pretty much all civs were neck-in-neck scorewise for basically the entire game. Darius and Washington pulled ahead recently by conquering their neighbors and a couple city-states, but even now, it's turn 262 and the highest score is 832. I ended up settling only two cities besides the captured Cusco, since there wasn't much other good land worth settling on that continent. China is to the south of me, across a barren stretch of desert, hills, and mountains. I tried to take out her capital, but by then the window for a Bowmen rush was already closed, and since there was no Iron AT ALL anywhere close to my lands, I ended up just leaving her alone. Wu had a nice capital, but otherwise very little good land at all, mostly barren tundra. As a result, I was perpetually at war with her for a good portion of the game. She couldn't touch me, but her sheer mass of units (she led in military for most of the game), plus Cho-ko-nus, made an invasion of her lands more costly than I was willing to invest in. I struggled with keeping my gold up for much of the game, so I couldn't ally any Maritime city states to help boost my population numbers, either.
The sheer strength of my capital carried me through, and I'm on my way to a Science victory. I'm sure a more experienced player could have done a lot more with this start than I did, but I only bought the game recently, during the Steam sale, and I'm still kind of learning the game and moving up the levels (this game was played on King). In retrospect, I should have probably conquered and puppeted the two city-states on my continent, and beelined Chivalry after finding no Iron to take China out with Knights. Since I ended up settling so few cities of my own, annexing Cusco and building a Courthouse to control it directly probably would have been a good move as well. This may have also been a strong game to simply go for a Cultural win instead of Science.
My lands (note the low scores for both myself and the AI)
China to the south of me (her conquest of Ragusa was very recent)