jill of all tirades

I recently came across a website called Flowing Data, check it out when you have time.  I first saw the visualization of the growth of Walmart.  If you watch the video, it looks like a bioterrorism attack that was orgininated in Arkansas.  It actually looks rather scary.  After that video became popular, a growth of Target video was created.  The Target video does not look like a plague crossing the nation; hence, it is less exciting.  I found it interesting that California had a huge number of Target dots and fewer Walmart, and conversely Arkansas had many Walmart but few Target.  Everywhere else on the map seemed to have a mixture of the two.  Is it just CA and AK that have extreme loyalty to the store that they shop at?