I was a little slow on this one, but here is some feedback. Has Optional already said RCP is not a factor in C3C.
One issue is that you are next to last in the number of towns. You have 12 in the game, but have only met 4. The one big advantage humans have in a continents game or archi map is they will send out boats into the ocean, without Nav or Mag.
This lets you met others that not everyone else knows. This lowers your cost of techs, if they know them. It often lets you make good trades, when you met some backward nations. You did get out and scout the land via circumnavigating the continent.
Not a great chunk of land, but not the worse you have ever seen either. Nasty part is no river and the land has lotsl mountains, except for the tile next to the volcano, nice touch.
You did drop St. Regis next to a volcano, any reason? With grass hard to come by, I would not want to plant one next to a volcano.
No horses, so no MW. Once you have some idea of the layout, you may have been well advised to consider packing in to a CxxC as if you were on an island. You have so many hills and mountains and no water to allow mountains to be used. This suggest using the coast more than I would like, 2f 2g is beter than nothing.
19 workers for 15 towns, is not much considering all the hills and mountains.
Why have someone plant a tree in the middle of nowhere? I would rather see him clear the grass of pollution and put it back into use. In fact I would not have planted that town in the grass. Put it in the tundra and it still gets it food and the grass is available to use.
I would suggest you not have workers doing task in solo mode. Gang them up so they can get a task done in single turn or 2, rather than many turns. That gets the tile into production now, not later.
A lot of places are on wealth, that is fine late in the game or in farm towns, but not for core cities. If nothing else build replacements for the spears and swords. A pike is useful, a spear is not.
Let me say right off, I disspise giving two lux to anyone. That is too much help, unless they are way behind or you are dead meat anyway. Here you are giving 2 for a lux you could have had all along.
Ganasetaigon is making an aqua, but it is not able to feed 6? Well it can, if you put the pop on the grass or the water. Grass gives 2g 6 beakers, water 3g 6 beakers. Not sure I would spend all those shield to get a 7th pop that will starve. One thing for sure, you cannot afford to let a town go to riot.
Bursa's placement is very aggressive as it has tiles that would be yours. Was it planted, before your borders popped?
I would not be making temples/libs in Akwesasne or any tundra land locked town. Just ICS the area and put the lone citizen to science and save your money. It is making 3 beakers and rasing a lib, it will cost as much as it gives. I would prefer to plop down 4 or 5 towns in the tundra and take the support.
You have a temple every places, it looks like. You have a colosseum in many cities. That is a lot of shields back, when you should have been expanding by peace or force. Just grabbing the dyes alone would have been worth it. It is a bad break that Alex is your neighbor, so force would have been expensive, but you have to pay at some point or be locked down.
Caughnawaga making a court, it is a size 3 town? It can only feed 4. Not a good investment. The small empire size and lack of cities means you have tiny free support.
You do not have a single cat or treb? I think I would have detected Alex is my only target and made a bunch of cats and tried to take some land, long ago. It will be a lot harder. He will go from Hops to muskets, neither is a lot of fun for swords and MDI. You only have 6 total and a longer boarder to defend.
Reduce science for a time, put cities on making MDI in barracks places and trebs in non barracks towns. You could toss in a couple of Longbows in non barracks towns, if you have to in order to get up an army. They can be used to get in ping on defense of the pikes.
You will need settlers to combat replace a few towns as they are flip risk I would guess and if they are yours will draw less ire. IOW the first town you capture of Alex, will get him to come for it.