Before starting again, I changed my mind about a couple things because I dont think Chivalry will necessarily come in very soon. Russia is the only one that has it. The Ottomans and the Zulu are the only others who can research it (and are really the only others with significant research ability anyway), and the Zulu are likely to be working on Gunpowder while the Ottomans should be doing Invention.
Since it may be a while before I get knights, I decide not to save my empty army but to fill it with Mounted Warriors. With the number of elite wins possible against Sid, I should be getting a new Great Leader every few turns anyway, so there is really no point in saving any. Ill just have to be aware that a mounted warrior army may actually be attacked.
The other thing I changed my mind is money I was going to accumulate a stash to upgrade Mounties to knights, but I think I might as well spend it rushing things instead so I do that before hitting enter.
I lose one mounted warrior that I left in a bad spot due to a misclick, but a pike of mine slays another ancient cavalry.
It appears that Russia and America are no longer at war since I could see Russia troops pass by Americans without attacking. In fact, they are sending down great troops for leader fishing I can see 11 archers and 1 warrior, but I really dont need the distraction right now. Ive got to get rid of cities instead of wasting time killing units. Ill have to raze these last few American towns that are between me and the gems (and me and Russia), then get America to redeclare on Russia.

The resistance in Portland finally ended!
The Russians completed Knights Templar I definitely have to take care of them soon
330 BC I reconsidered again. I think I am wasting too much time even going after America. I need to clip Russia before they get too powerful, and I need the Pyramids, and I need gems. America has an extra source of gems hooked up. I start by killing a couple redlined Americans with elites (no leaders), then sign peace with America. I cant get any cities, so I only get their 6 gold for peace. As a separate transaction, I sign an alliance against Russia giving up 14 gpt. Finally, I get their gems and 18 gpt for Monotheism. They can now research Chivalry, but I doubt it will be fast.
My trebbies will never make it through the jungle to Russia, so some stay on the line waiting for the next American war, others return to the homeland to redline any Zulu landing parties.
IBT I have front row seats to watch the Americans and the Russians battle it out. From the units I saw, Russia clearly got the worse of it, but they did capture Phoenix and Albuquerque for me. My Golden Age ends.
310 BC No battles, just start moving toward Russia. There are indeed a lot of Russians around:

There are 31 in that picture. My stack is 3 armies and 20 mounted warriors.
IBT The Americans and Russians continue to pound each other. The Heroic Epic completes. Russia discovered Theology. The Aztecs have a worker for sale

- I wonder where they have a city on my continent

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290 BC I ignore the Russians units and move toward Phoenix. The Americans are getting in the way. My military has improved to average compared to America so I can crush them anytime I want.
IBT The Russo-American carnage continues as I watch, but Im having a hard time getting my units anywhere relevant. I learn Chivalry! I cant see who else has it, but it must be either the Zulu or the Ottomans since they are the only ones who wont talk to me.
270 BC I start upgrading to knights, but it will take a looooooong time.
250 BC The Zulu will talk, and they have Chivalry. I pay 6 gpt for peace. Incense, ivory, and 13 gpt get me furs and dyes. I also borrow all the Zulus gold for upgrades.
IBT The Incans and Russians sign peace, so the Incans declare on me. That makes the Aztecs, Ottomans, and Incans all happiness providers. Many cities celebrate We Love the Chamnix Day

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230 BC My troops finally made it through the jungle to reach Phoenix. I capture it easily. Im keeping this city mainly to keep the road intact. With Phoenix under my control, one army continues toward Minneapolis, and my rearguard knights head for Albuquerque.

210 BC Albuquerque falls to the knights of purple. I continue to rack up the elite wins and this turn, I get my fourth army.
As the Russian units get cleared out, I try to find tiles for my workers to road. Any roaded tile that I can get to gets a unit on it to prevent the Americans from slowing me down.

IBT my first galley completes. Im already looking at the Zulu. Based on the power curve, they are the ones I have to stop. Russia still comes first, and they are no weaklings either, but I want to be prepared for the Zulu campaign as soon as Russia is broken.
190 BC Minneapolis is mine.

IBT The Americans learn Theology so I will get it next turn. Still only the Zulu have Invention. Somebody else better get to Gunpowder before 2 tribes have Education...
170 BC - I upgrade the last of my mounted warriors in the homeland. The ones that are with my armies will be upgraded if I find a barracks somewhere, but they are not returning home.
For a little variety, heres a shot of the core:

IBT Mongols and Aztecs sign peace giving me my 4th source of war happiness. I now have close to 100% happy people everywhere with no luxury spending (98% approval rate per F11). The Russians learned Education.
130 BC My units have reserved a path through the jungle safe from American interference. I shift lots of workers in that direction. Some get started right away, others will arrive soon to finish the job more quickly.
IBT Phoenix is my first city to be lost via culture flip. Now my road runs through American territory.

110 BC Sign a Right of Passage agreement with America so my troops will reach Russia before 2050.
IBT Zulu complete Leos. The Aztecs land 1 archer in my territory

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90 BC The north-south highway is fully under construction. The plan of attack is for my armies to go right past the thousands of Russian troops and head straight for the cities to raze them. My troops will take care of the Russian units. 19 workers (including slaves) are already at work roading and more are on the way.

IBT The Zulu have Theology. It looks like they are just too far ahead of everyone to get much out of the Great Library.
70 BC Pick up Great Leader #5. Armies raze both New Yekaterinburg and Kostroma. I have a bunch of settlers on their way north to resettle the jungle. A mere 56 Russian units in sight. The American stack on the mountain has 41 units. Looks like I lost the picture for this turn
Score at 70 BC = 1970