Hmm ... I have a lot of thoughts, but I'm not sure how to put them into cogent sentences.
First off, another round so very well-played -- maintaining a tech lead amidst a war and a faltering economy is nothing short of miraculous!
Espionage
Hammurabi is most likely to beat you to Liberalism (what with the Masjid Al-Haram churning out ~20
+ 
every turn in Babylon and all), so I'd put 100%

towards him to gain sight into his research.
After that, I'd probably put 100% towards Peter (or whoever your after-Washington target is going to be).
America
The Silver you want is 3 border pops between Washington and New York. If you want it, your quickest route is to allow G.W. to keep either Washington or New York and make him your vassal. (Otherwise, it could be the end of the game before you see that Silver again.)
American soil isn't as good as yours, but it isn't altogether horrible.
Chicago and New York have dead tiles but with good food and tiles to work with and so are worth assimilating.
Boston and Atlanta have dead tiles but are half-decent; it wouldn't help or hurt much to assimilate them.
Philadelphia, Washington (see above, also) and Seattle are food poor and not worth assimilating.
Portland and Los Angeles are crap.
If plausible, capture and keep Chicago and New York. Vassalize Washington and liberate everything else back to him.
You should consider bribing Peter and/or De Gaulle into peace with Washington to prevent him from becoming an ill-fated Vassal to either of them.
Victory Condition
What is our desired victory? It looks like Domination, but I'd rather ask and know for certain than assume and be incorrect.
I specifically ask this, because we need to also begin thinking about the target
after Washington and how to approach the task without turning the world against us.
Religion & Politics
Triangle #1, "The Guerrillas": Wang Kon - Shaka (Sisiutil) - Hammurabi - Washington
Our trading block is the most technologically advanced but is otherwise militarily weak.
Hammurabi is in love with everyone, so only Wang Kon can be presumed reliable as a military ally but only against De Gaulle or Peter.
Cannibalizing our trading block is always an option, but now doesn't feel like the right time for that.
Triangle #2, "The Earth-Shakers": Peter - De Gaulle - Hammurabi
If Peter and De Gaulle are left unchecked, they're going to dogpile and conquer the world.
One (or both) of these two need to be broken off the Islamic block and put on the
chopping block.
They both have good and bad points to them, so it's really hard for me to decide which should be targeted.
BUT, Peter has the best land and is #1 on the scoreboard. If you side with him, he's only going to become an even bigger threat.
As audacious as it seems, converting Peter and bribing the world to dogpile him would cement your power and all but guarantee you a win.
With your Diplomatic prowess, I have complete faith in your ability to accomplish just such a feat!

The Apo-freakin-stolic Palace
Hammurabi discovered Theology and traded it to De Gaulle and Washington. He's the only one of the three at peace, so there's a 92.713% chance he'll build & control it.
Since he's in love with everybody, I'd expect a lot of "stop the war" votes in the future.
I'm not sure what that means for planning, though, because I'm terrible at dealing with the AP, but there it is.
Summary
Take Chicago and New York. Vassalize Washington. Spam Confucianism to and convert Peter. Bribe world against Peter. Win.
-- my 2
