When I go to an online store to purchase something, it's the usual routine. You ask me to fill up my shopping cart, select a shipping method, and then log in with the account I made -or- sign up. I give you a billing address and a shipping address, but why do you always insist on having me scroll through a combo box as tall as the browser window to select my state? I give you my city and ZIP code, can't you figure it out from there? I have even been to some sites that figure out the city/location name based on your ZIP code. I *know* you can do this, so how about you stop asking me for my state all the time. Let me give you the ZIP and you go from there.
Is there a legitimate reason that online shopping carts can't figure out the US state based on ZIP code?