JAILHOUSE ROCK: 3 STRIKES

I'm not an attorney, so don't take my word for it.  However, I believe the three strikes system is state by state.  The Federal government does not have criminal jurisdiction unless and until the particular crime crosses a state border.  In the scenario you described, the thief was caught in the state where the particular crime was committed.  The criminal would be tried and, if there is sufficient evidence, found guilty and punished by each sovereign state.  Now, if the person stole from a shop in Portland, Oregon, then another in Willamette, Oregon, then another in Columbia, Oregon and was convicted and sentenced separately for each crime then they could be sentenced under Oregon's "Three Strikes" legislation (if they have it - I don't know whether they do or don't). 

On the other hand, if the person stole guitars in Oregon and sold the stolen merchandise to someone in California and shipped them to that person, then the crime has crossed a state border and it is now Federal jurisdiction, as well as the jurisdictions of Oregon and California.  In other words, that particular criminal is facing charges in THREE jurisdictions for the same action and in a WHOLE lot of trouble. 

Again, take that explanation with a grain of salt because I'm not an attorney and while I do work in the field of law, I do not work in the field of criminal law.  My area of knowledge is Federal contracts legislation and regulation. 

- Zurf