Which is based on the Supremacy Clause, federal law preempts state law, even when the laws conflict. Thus, a federal court may require a state to stop certain behavior it believes interferes with, or is in conflict with, federal law.
They were there against the civil right worker's murders. While the black population at the time was allowed to vote, in the Southern states they were withheld from voting by all sorts of idiotic reasons.
Basically they’re saying that Italians, Germans and Japan is the only group they can rely on. They will only trust each other and no one else. If they keep everything through marriage they will make each other more powerful. They can’t betray each other because they are “friends”. They can’t trust no one. It’s saying only marry Germans, Japanese and Italians. You can’t marry someone else for example: Americans, British people and so on because they are enemies. They will just bring you down and betray you.