Is that the law?
Is 1000 a day an invasion?
You will have to show me the law that gives states the authority to declare an invasion.
Precedent says you are incorrect.
"But at least three courts went further to hold in the alternative that, as the Second Circuit put it in Padavan v. United States, “In order for a state to be afforded the protections of the Invasion Clause, it must be exposed to armed hostility from another political entity, such as another state or foreign country that is intending to overthrow the state’s government.” See also, the Ninth Circuit’s opinion in California v. United States (“California ignores the conclusion set forth by our Founders. In The Federalist No. 43, James Madison referred to the Invasion Clause as affording protection in situations wherein a state is exposed to armed hostility from another political entity.”); and the Third Circuit’s decision in New Jersey v. United States (New Jersey “offers no support whatsoever for application of the Invasion Clause to this case or for its reading of the term “invasion” to mean anything other than a military invasion”)."
The claim that a large increase in the number of migrants gaining entry at the southern border is an “invasion” is constitutional nonsense.
www.justsecurity.org