Which of the following was a key principle of judicial review established by Marbury v. madison

The U.S. Supreme Court case Marbury v. Madison (1803) established the principle of judicial review—the power of the federal courts to declare legislative and executive acts unconstitutional. The unanimous opinion was written by Chief Justice John Marshall.

hope this helps

-18 metres sorry if im wrong

might be agreeing to participate ethically with other european nations in the slave trade

or notifying other european nations when taking possession   of african territories