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.
United States v. Abbott and State War Powers

A federal court of appeals has upheld the right of Texas to defend itself against illegal immigration by erecting a barrier in the Rio Grande River.
The Great John Marshall: Part 1

John Marshall helped secure adoption of the Constitution.
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.
Understanding the Constitution: How States May Respond to Illegal Immigration—Part IV

Some defensive state war powers should not be subject to federal preemption at all.
Understanding the Constitution: How States May Respond to Illegal Immigration—Part III

The state invaded has the right to seek out and kill the invaders and those responsible for the invasion.
Understanding the Constitution: How States May Respond to Illegal Immigration—Part II

Under the Constitution, the states may wage defensive war without federal permission.