We are now physically, politically, and economically one world and nations so interdependent that the absolute national sovereignty of nations is no longer possible.
National sovereignty is an obligation as well as an entitlement. A government that will not perform the role of a government forfeits the rights of a government.
You can't get closer to the heart of national sovereignty than national security and intelligence services.
If U.S. national sovereignty continues, it is only as a state that Puerto Rico will have permanent 10th Amendment powers over its non-federal affairs, as well as voting power in Congress.
Courts have long recognized the federal government's robust power to inspect people and goods entering the country. After all, the very foundation of national sovereignty is a nation's ability to protect its borders.