That would be the Louisiana purchase of 1803.
Answer:
B. Federal laws can supersede state laws
A is the answer explantion
So the country doesn't kill itself ......
B is the correct answer.
The Supreme Court hears very few of the cases that are brought to it. The Justices decide amongst themselves which cases they will grant an writ of certiorari to, giving them an audience in front of the court. No other group may tell the Supreme Court what cases to hear.