On T117, Huayna demands Maths. I comply, which puts him at Cautious, thus allowing me to trade Currency for Monarchy and 30g. I delay the Hereditary Rule revolt to the next turn, on which I bulb Philosophy for Pacifism. I fiddle with SPI for a while, running Caste System in 5-turn intervals, to speed up some GPP.
With the capture of Tours, De Gaulle makes his exit on T129. I send a few forces westward to take a barbarian city (Sakae) that borders both Sitting Bull and Huayna; meanwhile, the bulk of the army heads south for Washington. I get Horseback Riding from Julius, shortening my supply lines in the upcoming war; for the same reason, I produce catapults first, as horse archers can quickly replace swordsmen later. T132 sees me switch to Bureaucracy, and the empire breaks 350 bpt on T136, with a Great Scientist for Education on the horizon. Nobody else has researched either Philosophy or Civil Service, nor Literature for that matter. I decide to put Liberalism on the backburner, preserving the option to take either Rifling or Steel after a Chemistry double-bulb. In the end I take Rifling in 1260 AD (!), having researched Machinery, Feudalism, Engineering, Guilds, Banking, Gunpowder, Music, Printing Press, Economics (free GM) and Replaceable Parts myself -- nobody has anything of note for trade. Par for the course, actually; I always encounter this mid-game research gap on Emperor. The computer-controlled civilizations will suddenly spike in GNP roughly when Printing Press comes around (to them, that is), but nothing happens before that (well, except that this encompasses the Cuir/Cav window -- see below).
I begin to neglect city management as I take Washington's northern cities (New York and Rostov), when Julius decides to jump in. He absolutely rolls over eastern America. In reaction, I switch research to Feudalism, bribe Stalin into the war to distract the still-sizable forces defending the American core, and capture the capital soon after. Thus I obtain his instrument of surrender, but not before the Apostolic Palace, which Comrade Koba absurdly presides over, formally calls the entire planet to war with Washington.
Unfortunately, Stalin starts to plot (at Pleased) almost immediately after the war, just as the Golden Age of Cavalry is dawning. I had originally planned a romp across the Wild West, as both Huayna and Sitting Bull are severely lacking in military tech and units, but now I'm preparing for a preventive strike against Russia instead. An army of about 20 cavs stands ready to attack Moscow from the west; the Russian capital is close to Tours, and its capture will threaten no less than three Russian cities further inland. A smaller force operates in the Niani-Rostov region, where I intend to capture and hold Yekaterinburg (west of Niani). A third strike force will be assembled at Washington, my southernmost city, to move against Novgorod (a natural chokepoint) and the outlying cities.
While I capture no less than six workers on declaration, Stalin has already prepared a large (if hopelessly Medieval, Gunpowder-lacking) stack for me, which retakes Yekaterinburg and threatens Niani. I attempt a somewhat clumsy "defense in depth", constantly retreating stacks of 5-6 cavalry behind my cities to snipe wandering smaller stacks, covering them with rifles, then repeating the process. This works well, to my surprise, especially since the computer likes to split off catapults en masse while the bulk of the forces idles inside a frontier city. I do lose Niani for a turn, but I'll gladly exchange a library for Stalin's entire army. He doesn't last long after that. I obtain the Mausoleum and some marginal wonders.
Since Julius isn't plotting (he has dropped to Cautious -- diplomacy could have been better) and he keeps his stack within my field of vision at Chicago, east of Washington, I decide to hit Sitting Bull next. His cities fall in short order, but one turn before I can take his last vestige on the mainland, having just rejected his offer of capitulation, Caesar vassalizes him and moves in against me.
The war is fun due to the sheer size of his empire (and accordingly, his army). The garrison I kept at Washington pays off, as its cannons and rifles prove instrumental in its defense -- drafting/whipping alone wouldn't have cut it. I hit spread-out troops advancing towards the city, reserving Barrage cannons for the stack -- even if I lose some battles, the survivors will be weakened enough that they cannot keep up with drafted rifles. In the meantime, I manage to raze the city of Setia east of Kumbi Saleh. Good thing I didn't keep it, as a gargantuan stack appears from the fog, heading for Kumbi Saleh, but by now my armies have returned from the campaign against Sitting Bull. I wait for the stack to crawl towards the city, then hit it with six cannons and about 40 rifles/cavalry, wiping it off the map and allowing me to strike anywhere I want. Therefore, I ignore the border fortress of Philadelphia at first; indeed, after I have taken Navajo further inland, Julius feels pressured to move out his pikemen against small stacks of cavalry, and I don't fear them on the grasslands. All the while, groups of fresh cavalry can quickly approach Philadelphia.
Railroad comes in around this point, the final tech I found necessary; I turn off research and automate all my workers.
His defenses are still strong enough that I can barely reach Rome by the time he starts fielding riflemen of his own, and he refuses to capitulate even after I've taken Antium and everything south of Rome, so I have to attack Huayna for Domination. The narrow "Tiwanaku corridor" west of Lyons leads directly towards Cuzco; unless Huayna has large reserves in the area to challenge my 50-cav stack, his capital can be taken within four turns of the declaration. I fire a 2-GP golden age for good measure.
As it turns out, his reserves in the area consist of four longbows, a pike, and a crossbow. To his credit, I spy some cuirassiers on the turn that I take Cuzco (which was marginally better-defended than the cities on the way), which pushes me over the 64% edge in land area as its cultural pressure vanishes from what used to be Sitting Bull's frontier cities.
T136 save attached (before war with Washington), as well as the replay.
Thanks for the map,
@Pangaea!
3
with a lighthouse and should be worked asap. You should be able to get 
-resources via trade at this point.
. I think I currently have 6 workers, which might be too few, but I didn't build more because until IW I literally didn't know what to do with them anymore, since I didn't even have Pottery.
If JC declares, you're basically dead, especially without metal. At Annoyed, there is a 90% chance JC will declare war.
