 Research has also found that anticompetitive state provisions restricted out-of-state growth when those provisions were more restrictive than the provisions set by the Interstate Banking and Branching Efficiency Act or by neighboring states.Some states have also had restrictive bank branch laws; for example, Illinois outlawed branches (other than the main office) until 1967, and did not allow an unlimited number until 1993.Texas historically has heavily restricted the operations of banks.For example, it was not until 1980 that Article XVI, Section 16, of the Texas Constitution was amended to permit banks to have unmanned teller machines (ATMs) in the county of its domicile.