Okay, I looked at the old thread about this and I still cannot seem to be able to beat the boss. I have looked up strategies videos, but I still cannot pass it. He always follow me when I expand in northern USA and Canada. I have tried to beeline to other places like Europe and Asia but he always comes after me even with out him being adjacent to me. I have tried to get behind him but I can't as he follows me even when I am in a different continent. Please help!

Edited 12/15/2016 00:23:19

There are several videos on youtube soving you how to do it. (Including mine, quite dull boring one. https://www.youtube.com/watch?v=7Xk3aIk-a6A)

The Key point is ALWAYS to NOT fight the boss. Just late attack the territory that it is standing on. It may take a few tires (particularly for gold star) but the level is actually quite beatable.

Just, don't focus on the boss at all. Just clean up after it.