The more states that follow Louisiana’s lead in setting a date for independence, the more states in middle America that won’t want to be left behind to be ruled by the East and West Coasts. So there will probably be no border near Louisiana, but rather near those coasts, because other states will join Louisiana in a federation.
Currently, hundreds of thousands of people commute to work daily across the US / Mexico or US / Canada border using a passport card, so the new border does not need to be a hassle. Louisiana could make all driver’s licenses to be passport cards.
Since the US government does not take border security or immigration seriously, it’s a good thing to add a border guarded by a government that does.
A 2017 article says “U.S. and Mexican citizens and permanent residents can …[obtain] the Secure Electronic Network for Travelers Rapid Inspection (SENTRI) program, a pre-approved accelerated crossing pass for low-risk travelers specific to the U.S.-Mexico border that cuts transit time significantly via dedicated vehicle and pedestrian lanes. Non-SENTRI-holders that have electronic Radio Frequency Identification chips in their documents, meanwhile, can take advantage of “Ready Lane,” which scans their identification from ten to fifteen feet away — sort of like an EZ-Pass for your travel documents.”
Many ask “will I need a passport if Louisiana becomes independent?”