I believe it was planned that way. By establishing L.A. as a major city, New York could be confident that any nuts inhabiting their metropolis, would fall of the table and roll down hill all the way to California, making the chances of them returning much more difficult. <br />
Proof can be seen in the documented migration of New York nuts, from Greenwich Village (the nut tree of NY) to Hollywood (the nut bowl of America). I hope my scientific ba<x>sed BS will be satisfactory answer.
When people started to build cities in this country they had to figure out what to do with the large amounts of distance laying around on the surface of the land. At that time they had not better idea than putting all the distance in between the settlements. Bad move, indeed.
thats just the way it is....