We are joining the Daggerfall Covenant.
http://elderscrolls.wikia.com/wiki/Daggerfall_Covenant if you want a little read.

"Our supplies dwindle. Our trade routes are shut down. Our people suffer. Why? Because a pretender sits upon the Ruby Throne. Let us take up arms! Let the fields of Cyrodiil run red with the blood of our fallen enemies! But let us spare the lives of a few, so that they may return to their homelands to tell their fellows the fate they met at the hands of the Daggerfall Covenant. One land! One Emperor! Who among you will stand with me?"
―Call to Arms, High King Emeric