Treaties and established customs recognized by most nations are some of the things that are included in international law.
International organizations and sovereign states usually enter a treaty, an agreement under international law. A treaty has a lot of known names such as exchange of letters, protocol, agreement, pact, convention, or covenant.
I belive the answer is Secondary Source. Becasue its a politcal cartoon and not a direct news source.
The Nazi policy of exterminating European Jews. Introduced by Heinrich Himmler and administered by Adolf Eichmann, the policy resulted in the murder of 6 million Jews in concentration camps between 1941 and 1945. It was a Nazi plan for the genocide of Jews during World War II.