To piggy back off of nittany's comments as he is most in tune with what I know and understand, as a military brat, I was born in California, reared on several military bases in the midwest while my parents' state of residence were in TN and IL. After my parents split, I moved to one of those states and I never intended to remain there because I always planned on going to college out of state and living somewhere else. I ended up going to college in that state but always maintained that I would never permanately settle there; so, in essence, I never established residency in that state even though I lived there for 10 years.
So, what was my state of residency while I was in college? California because I was born there. Now I have moved to WA and have publicly asserted that I have no intention of remaining here; I have maintained all of the same banking accounts that I had in college and I have been registered as a voter there so where is my place of residency? Hint, it isn't WA.