i live in Portland! It's actually the most populous city in the state of maine
Oh really? Whenever I hear of the city of Portland, I usually think of Oregon. 
Portland in Oregon is the largest city in that state :) There are several Portlands
I didn't know there were so many Portlands, especially so many popular ones. What else do you know about the one in Maine?
Don't know much about maine but i know that Portland , Oreegon was named after Portland in Maine
So the Maine Portland is the original huh? I had no idea. 
it is! and that one was named after the English Isle of Portland
Wow, so what made that Portland so well known that we named a city after it?
Honestly i don't even know! MAybe because it is a central part of the Jurassic Coast, important for it's geology and landforms
That makes it sound pretty vital, so that is probably a good deal of the reason for it