I'm going to pick at this AAR a few years at a time, because I'm a little busy with work, an upcoming vacation, and 17 Chaos kicking off. Plus, I could easily write a novel about this game. So, here goes nothing...
I really wanted Britain, and I was super excited that I won the die role to get the position. I felt like if Britain could just slop and guile his way through the first year or so without getting in massive trouble, then this was the position that was most likely going to solo. I also felt like there were some philosophical mistakes made by the previous Britain players, and I wanted to trial-by-fire my own thoughts on how the position should be played.
My objective in the first year was to keep everyone happy, don't rock the boat, and promise aid a year or two down the line once I had a chance to develop my position. From south to north...I talked to Chile about working against Argentina, Argentina about working against Chile, and Peru moving south against one or the other. Peru was actually the first one to talk to me, but other than exchanging pleasantries I didn't really get much out of him. Chile never really talked, and I believe JonS has since acknowledged elsewhere that he was really busy. Argentina talked around the idea of working together, but I never really got a great vibe from him (something that continued through much of the game before we were at open war). Regardless of what had come out, I was planning on trying to get Pat in the first year, and whoever countered that effort would immediately have a target on his back.
Further north, Venezuela approached me early and hard/vague about working together. My read was that he REALLY wanted to find a way for Venezuela and GB to work together, to the point where he was willing to not move to Del in the first season. Great! One neighbor that I need not worry about. He also telegraphed pretty heavily that he was going after Brazil. Even better! I promptly fed that info into the propaganda machine to prod Colombia and Brazil in his direction (I believe at the time I wanted to hop on Venezuela with them in 1841, once I had established myself in the Caribbean). Sorry Venezuela, either I was going to have problems in the Caribbean and I wanted you to not be a problem, or I was NOT going to have problems and I wanted your centers for myself.
And in North America, the interesting stuff. My read of the Caribbean is that, if either Spain or GB can occupy all of Hispaniola (SDo and Hai) early, than the other party is a dead man. Both island provinces border 3 sea spaces, and those 3 sea spaces border (between them) no fewer than 9 other centers. So, if someone can put fleets in both SC's, that person can basically dictate the flow of traffic to 11(!) SC's. So I wanted to keep peace with Spain, but I wanted to do so without abandoning that island completely. Which is pretty much what I expressed in my message to him (I got greedy and said if he wanted to leave the whole island to me, he could do that too

). After a bit of a tussle where he thought I was demanding both SC's rather than being open to splitting one and one, he agreed. I told him I wanted to give him an open southern flank so we could go after USA (me from Canada, him from the Caribbean), and to be honest, had he not stabbed so early, I probably would have gone through with such an arrangement.
I talked a bit to Mexico about attacking USA as well, but I never really got a great relationship going with Mexico (even when we ultimately started coordinating a bit later, I never really felt super confident in what he was doing). I talked to USA a bit about keeping the peace and coordinating in the Caribbean, as well as requesting / demanding a bounce in NYS. I had seen in previous games the outcome of "bounce neither" and "bounce both" WRT NYS and NEn, and I decided in this game that I didn't really think either was ideal. I wanted to keep Greenland in play in 1840, and to be honest bouncing only NYS means that, at worst, I would need to cover Hal while taking an SC, which didn't seem like the end of the world at the time (especially because NEn would be occupied with a fleet, and F NEn can't influence anything in NYS).
So the first season flips, Spain seems to be going along with what we had worked out, USA moves to NEn, it appears that Spain and Mexico are attacking USA in Texas, AND Venezuela supported me into ECS as requested. Well, the USA move to NEn wasn't ideal, but I can counter it, and I potentially have 9 builds in play. I actually had orders in to take Tor and leave Greenland open until after the order submission deadline and changed them maybe a half hour before asu resolved orders to take Greenland instead of Toronto, and I think that was critical for what wound up unfolding next.
Because then the fall orders flipped, and Spain took Jamaica...