A few questions here (great work BTW)
One is Les Rocheuses being an internal territory. Their population is clearly too small to be a state, but everything else out there seems to be a Autonomous region of some kind. Is there a reason for this? White majority? Unable to decide who gets it?
Two is the question of Pacific Access. You mention acquiring Manitoba was this towards an unfufilled goal going from sea to sea? Was there a west coast state open enough for Canada to engage freely there.
Third is also related to water and trade. Locks connecting the Great lakes were largely finished by the 1850s IOTL, with 1848 being the year the Illinois and Michigan Canal connected the Mississippi Basin and the Lakes. However the Saint Lawrence Seaway, which connected the Atlantic and the Lakes didn't come about until 1954. Given the unity not ITTL, and the greater incentives for connectivity between the Atlantic and New Orleans do you think a unified canal plan would occur?
Finally, the Capital of Lafayette. Can't help but notice it was founded just after the founding of the Republic. Was this an attempt to break with the royal association of the old capital (which I presume was either Quebec or Montreal)? Also you imply an attempted Louisiana secession around this time, was moving the capital to a more central location a strategy to deal with an independently minded hinterland?