The Taj Mahal was completed in 1466AD.
I was on my way researching Scientific Methods when the 1502AD scoring deadline arrived. I had 5 sources of gems connected, and a total of 13 seafood resources.
Here's a bird's-eye view of my empire, which was in fact quite small given that we had 1502AD already...
I continued to expand and research techs. I prioritized Flight so that Delhi and Bombay, my two most productive cities, could build an airport to airlift defenders to any city that might get threatened in the future. It turned out that this wasn't really necessary, but it's better to be safe than sorry...
In 1754AD, I made the following trade: I sold Philosophy to Mao and Khan for gold. Let me repeat this: In 1754AD, I sold Philosphy! They both lacked Philosophy, Music, Theology, Banking, Gunpowder, and Paper. What had happened there?!? The other civs were far behind me, too! There had been no wars except the three phony wars against me (I know Arathorn would roll his eyes if he read this... ). They had all the builder's time they needed to develop their empire, and in the 18th century, I was an age ahead of all the AIs! Sure, I managed to get both the Colossus and the Great Lighthouse, so I expected to be ahead. But...this far? What the heck were the AIs doing? I was deeply disappointed about the AI's performance on this map - it looks like if you take their cottages away, they fall flat and are unable to compete. For crying out loud, some of them like Rome even had better starting lands than we had! Their ability to handle archipelago maps doesn't seem to be so hot, and this will be seen in another area soon in this game.
It was time to secure the last missing gems resource, and maybe to try to gain control of all gold and silver resources for extra points as well! When I had the techs for battleships, transports and tanks, I started to produce an army. And because doing so with such a production-weak empire would take ages, I decided it was time to switch on the first stage of the afterburner.
But even with the help of the golden age and some whipping, assembling a fleet to protect my waters, and another one to transport my invasion forces took quite some time. Finally, in 1835AD, I had a fleet carrying my first six tanks on Khan's borders, and declared war.
One reason was that he had been the first one to declare war on me, way back in ancient times, but the second (and more important) reason can be seen in the screenshot as well: He had flipped Julius's city controlling the last gem resource in the world I did not possess yet!
Poor Genghis, what followed could not really called a fair fight.
Unloading the tanks would cost too much time, so they attacked amphibiously right out of the transports instead. I captured Ning-hsia, then razed Neapolis (which had been founded on the gems!). Now I controlled all sources of gems in the world...or would do so at least, once Ning-hsia would come out of resistance and expand borders.
I braced myself against any counterattacks, but...apart from some caravels trying to blockade my harbors, nothing came. So my fleet moved towards another one of Khan's islands, which had a silver resource.
My two airports came in handy now: My tanks would capture a city, then would retreat back on the transports again and I would airlift in a garrison unit to the city, allowing my fleet to move on immediately. Seeing how outdated his units were, I even attacked amphibiously with damaged tanks - I never lost a single one. (In fact, I would never produce more than eight tanks total, which was enough in the end!)
In 1843AD, Khan no longer had any gems, gold, or silver, so I decided to leave him alone and make peace again as soon as he would be willing to talk to me again, which happened in 1846AD. Meanwhile, my fleet moved towards Caesar. He surely would offer more resistance than Khan, right? He was the tech leader of the AIs!
Well, yes, he offered more resistance, in a way. He had riflemen instead of longbows, yay. Which are still no match for city raider tanks, so I quickly had an additional gold resource and island. Again, I embraced myself for the upcoming counterattack...and nothing except some frigates came, again. While it was fun to use transports(!) to kill off offending frigates with 99% odds of winning, it was a bit boring to see that he never even tried to land an invasion force anywhere. Instead, he had huge fleets destroyed by me which were sitting uselessly in the ports of cities I captured, and I have no idea why he never moved them out. No land units were transported towards my empire by him.