- World War II intensified as Germany took control of Denmark, Norway, France, Belgium, Luxembourg, the Netherlands, and parts of Greece and North Africa. Japan conquered several countries and islands in Asia. These events greatly impacted international trade and the lives of civilians living in affected regions.
- In June, German forces occupied Netherlands as Jews faced intensified and systematic discrimination.
- In July, The Franks family were forced to move into the Secret Annex, beginning over two years of hiding to avoid Nazi persecution .