Territorial Evolution of Central America

My map of the Federal Republic of Central America from my UPCA Universe. This will be the 5th map of this country I have submitted and it really shows that alternate history can be an ongoing process.
The changes since my last map include
-The annexation of the Mariana Islands instead of the Philippines, which somebody pointed out to me were much larger and more populated than I had previously realized.
-A change of the Guatemala-Beliz border, which Im still not sure about.
-The change of the name from the "United Provinces of Central America" to the "Federal Republic of Central America".

Any suggestions would be very much welcomed.