May the States Block Illegal Immigration?

This post summarizes what earlier posts at this site have said about the states’ power to curb illegal immigration.
Responding to Professor Bowman’s “Immigration Is Not An Invasion”

The effect of this constitutional provision . . . is only to allow a state to defend itself fully—and without congressional consent—when invaded or about to be invaded.
Our Article on the Power of States to Combat Illegal Immigration Has Been Published!

This new paper summarizes state war powers and how states may mobilize them against unauthorized immigration.