Okay...Ze plan.
Points to keep in mind:
1) The thing with using Nukes...is beside being messy, cause a -2 whenever you nuke enemy lands/units...and a nice round penalty with everone else, 5 Nukes and the whole world will declare war on us.
2) Tokugawa is Pleased with us, and has spent a good chunk of time at war with Mao and Mehmed. Also, this means these guys all will have well promoted military due to the stalemate.
3) Tokugawa is lacking Railroads.
4) Two Nukes WILL ELIMINATE a stack of ANY SIZE force of enemy Navy. (I playtested this.)
5) Mao and Mehmed have a defensive pact, and the same tech level, so it would be prudent to consider them one big country for the purposes of this.
6) 1/2 of an enemy territory v(and pop?) counts for domination after capitulation.
7) We don't have alot of transports.
8) We have few tanks, but alot of Infantry.
9) Computers obsoletes Sankore AND the Minaret.
10) When War is declared, troops are expelled to the nearest untaken/home square.
So, with that in mind come our military options...I've nicknamed them...
A) The China Card.
B) The Kyoto Accord.
C) The Ottoman O-ssult.
All would see us allowing Wang to capitulate to us (and tacking no city even if he offers one) as soon as we take the continent. And all would see us getting spies over there fast, going through Japan.
First off, we have...
The China Card
As a protective Civ, we'll find trouble here no matter what the era. These guys are industrial powerhouses, and have excellent production capabilites in places our navy can't hit. Also, China has loads of flat land, We invade from our western shores through Gunagzhou, strike to Xian and Hangzhou...while taking heavy fire across plans from Ottoman and Chinese army troops. And, as we only have Infantry and Tanks, we'll be moving at a snails pace where I could see us gettign Gunship blasted. We'll have nukes of course, but beside being messy, will make it hard to get production/population up. I would do it...but I'm not so thrilled over it. I think we've better options on the table.
The Kyoto Accord.
We're short of transports, and the Japs really don't like the other two so much. So, we ferry out troops there then pop across the line somwhere and go raiding. It should be mentioned if they have a ROP with Japan, they can attack us BUT, they cannot bombard cultural defence in cities. Not a bad idea...but, a mixture of a logn border and the fact that every Nuke will raise Japanese paranoia...well, not the best. Better than China Card I'd say.'
The Ottoman O-ssult.
Transport our troops in boatloads to Japan and wait. Raze the two costal cites, build our beachhead, and use the inland sea. Send troops in Japan there to defend/upgrade. Now, they has a few benefits not instantly realized. First off, it's where our army is atm (west coast). Second off, no cultural issues means a fast cultural defence buildup. Then use our forces to secure Zonguldak and Matsuyama and head south. All this time, Chinese and Ottoman troops are fretfully emptying thier lands trying to kill us, and pick them off as they popup. Also, as soon as Toka delclares war, (if he does) our troops are sent to the outskirts of a city which is ours, and suffers no cultural issues. I like this plan the best because it means the war is fought on our terms, and leaves us fighting in the territory of a Civ who's not proctective, and renders the main advantage of the protective one useless as it tries to fight a cross border war. Not to mention, less war weariness for us, MUCH more for China.
Conclusion
My main point is that if we tech to computers, we can get Mech Infantry and Bombers, the first of which will be around 60 Mechs within a turn or two of upgrades. We can start the war with Bombers/Infantry then, by the time we're really into it in 20-30 turns, have Mechs. They are good defenders, good attackers...and have two movement points. If we go into China, I guarentee you they will clam, and give thier troops the City Defence trait. Not to mention the Ottoman force. And, we can't Nuke everything...3 troops = 1 Nuke from London...