I will attach the saved game if I can figure out how to do so.
You cannot upload files directly to this site. They need to be hosted by another site first. Then you can link to them here.
As for the problem, my guess would be, that you are playing an Evil race, and the trade route limiting UP issue happened. This is easy to verify. Just open the Foreign Policy screen and click on the United Planets tab. You should see a note there, if trade routes are limited for Evil races.
War is the only other thing I can think of, but that would have been a pretty obvious reason.