The legislation that effectively prohibited banks from branching across state lines and forced all national banks to conform to the branching regulations in the state in which they reside is the

The appropriate approach is the "McFadden Act".

Explanation:

This may be a U.S. federal statute that has provided interstate compacts the power to control commercial banks situated across national boundaries. The whole federal law, although amended, actually authorized financial institutions to always have interstate highway subsidiaries in quite a certain way that governmentally financial institutions have been authorized to always have subsidiaries throughout jurisdictions.