Art. IV, Sect. 4, U.S. Constitution - Who is responsible?
Considering that the equivalent of at least 10% of the Mexican population has come into the US illegally since 1986 (the last amnesty grant by Congress)...
Hasn't the United States failed in its Constitutional obligation to protect each of the states from invasion?
If so, who or what offices are liable for this failure and how do invaded states proceed against the United States to secure a conviction and remedy?
Constitution of the United States of America, Article. IV., Section. 4
The United States shall guarantee to every State in this Union a Republican Form of Government, and shall protect each of them against Invasion; and on Application of the Legislature, or of the Executive (when the Legislature cannot be convened), against domestic Violence.