When your flight (Alaska 250) lands at LAX Terminal 6, you will follow a sterile corridor to Terminal 7, where you will go through immigration, baggage claim and customs (and then drop your checked bags for your connecting flight, if you're on a single booking). You will then go out the doors into the Terminal 7 arrivals hall. You have to go back upstairs to departures and go through security again for your connecting flight. (All international arrivals have to go through security again.)
If there aren't huge lines at immigration this should be easily doable in 2:15. Of course if you have booked separate tickets then you are on your own if you miss the connecting flight. On the same ticket, the airline will take care of rebooking you. Also if you're on separate tickets, then you can't drop your bags again past customs, but you have to take them upstairs to check-in and check them in for your separate flight. If you do have separate tickets, keep your airline's domestic check-in deadlines in mind. You may not have as much time as you think.