Seeing how crappy my cities were, how strong china (who had built all the wonders) defenses were, and how good american cities where, I changed target.
Washington must get down!
I teched to CS and machinery, got myself a handful of maces and catapults.
I captured chicago while I was trying to get the free Great Artist from music.
Mansa musa was a lot faster than I was, figures.
No problem, I traded music for horseback riding and compass, still a good tech.
I finally completed the Great Library in 920AD

(I know games where the great library already has spawned 2 or 3 GSs at this point).
I teched to paper, captured New York and settled for peace (no way for me to get any further with my current forces) for optics, a world map and some gold.
Now I had 9 cities, 7 crappy ones and 2 reasonnable ones.
Due to sharing religion, Washington was still pleased with me, ready to trade

.
A few world map trades later, I had circumnavigated the globe

.
I went philosophy, drama, education. Traded for theology, adopted theocracy and started buylding up troops for another strike on Washington.
In 1244, I was first to liberalism, took astronomy, traded for feudalism and engineering and attacked America again.
I took Washington but was unable to hold it. It was looking a bit gloomy now.
I bribed my friends Mansa Musa and Qin in the war, to buy myself time to build more/better troops. I teched gunpowder, guilds, chemistry, nationalism, traded for banking and divine right.
Teched replaceable parts, economics (missed the great merchant, of course darn Mansa musa), rifling.
Then adopted nationhood and strated making progress in my war against Washington

. A few redcoats later, I recaptured Washington (techd constitution in between, then steel, corporation).
Now capturing cities was more like a walk in the park, but WW was climbing high (thus constitution for jails!).
In 1709, I finally had eradicated Washington of the continent and I settled for peace for a far away city.
On the same turn, I attacked china.
In the meantime, I had discovered corporations and democracy and had started the SoL.
My cannons + redcoats didn't face much resistance from China.
I teched scientific method, steam power and trade for military tradition while capturing chinese cities on 2 fronts : from the North with fresh troops, from the south with my veterans.
Slow moving troops means slow war obviously so I captured 1 city in 1715, another in 1732. After that it went smoothly (1736, 1740, 1742 for n°3, 4 and 5).
I was a bit short on troops at some point so china managed (at huge cost) to take back shangai. I took it again on the next turn, so no big deal.
I teched to biology and moved on with conquest : 2 more cities in 1752 and 1754.
Teched to communism and captured 1 more in 1762. Teched to assembly line (probably a trade with Mansa Musa) and started drafting infantry. China wasn't much threat anymore at this point.
I took 2 more cities (no more china on MY continent) and settled for peace (and 1 more far away city).
I teched to railroad finished (! finally !) the SoL and traded for physics (Mansa musa still was faster than I was).
I declared war on asoka, captured one city pretty soon and settled another filler city on my continent.
I bought (yes I did buy all the late wonders!) the Kremlin in 1792 and went on Indian rampage, buying troops in the cities as soon as they came out of revolt.
After I had captured 7 cities, I decided flight would be useful and stopped spending all my commerce on gold. Teched to combustion, then fascism (needed Mt Rushmore badly), while fighting the indians "slowly" (captured only 2 cities in 5 years

).
Captured 3 more cities, and revolted to state property (Saladin had built Versailles I planned to $ rush in Delhi). My troops were starting to get thin, and India managed to take back 1 city.
Took it back a few turns later + another city, teched to flight, then traded for electricity with Mansa Musa (he was pleased, near to friendly).
Took 1 more city, teched to artillery (did I tech or trade? I had such high commerce I could research most techs in 2/3 turns anyway so it's hard to tell from the turnlog).
I took 2 more cities, and France declares on me

. I almost didn't notice his troops. I guess Asoka bribed him, but it was quite suicide from louis to declare.
I killed all his troops in a few turns, then took the lonely city he had on my continent, finished Asoka, then took all french cities I could get near to.
Meanwhile I finished the pentagon (kind of useless at this point, but a few more points for me), teched to Radio and started the corresponding wonders.
I bought R'n'R in 1859, then teched to medicine (bad move, should have gone straight to mass media) for the red cross (a few more points

).
In 1864 I teched to mass media.
In 1867 I had the united nations (thanks to a GE).
In 1869 I had hollywood (thanks to a massive infusion of $)
I traded for industrialism from Mansa Musa.
I made peace in 1872 with France after taking Paris (less WW in the final run would only help).
I completed (thanks to my ironworks city) the Eiffel Tower in 1873.
In 1874, Mansa musa asks me to declare war on saladin. I jump on the opportunity to get him to friendly. Even More so wince I was going to attack him anyway (cultural pressure was unbearable in some formerly french cities).
In 1876, Mansa Musa votes with me for a diplomatic win

.
Not the best score ever (35k) but I was kind of scared to not win at all in the first half of the game, so I'm pretty happy with the result.