Doesn't america still have control over the Panama Canal in this timeline?  I looked at the maps and it pointed the Panama Canal as US controlled.  Even when isolationist I imagine the US would not want Colombia touching the canal, after all the U.S. Made panama independent to make that canal in the first place. 

However if the U.S. Doesn't have control over the canal or is really that isolationist even there than I'll need to ask Mihndar what brazil would do.