califonia has a class action lawsuit dealing with toxic chemicals that cause birth defects and cancer. why hasn't other states followed this action

If there is a class action filed in one state, it applies to all claims made from any potentially injured party, regardless of what state they live in.  Class actions do not need to be filed in every state.  That is the very nature of a class action, to have all the potential claims in one case, and have them all resolved at the same time.