In Chapter 1 of "Number the Stars" by Lois Lowry, we are introduced to the story's main character, Annemarie Johansen, a 10-year-old girl living in Copenhagen, Denmark, during World War II. The chapter establishes the setting and the escalating tension of the Nazi occupation.

Key events:

* The Nazi occupation: We learn that the Nazis have occupied Denmark for two years, imposing strict rules and restrictions on the Danish people.

* Annemarie's daily life: We see Annemarie's ordinary life, filled with playing with her best friend Ellen, helping her mother with chores, and learning about the war from her family.

* Anti-Semitism: We learn that the Nazis are persecuting Jewish people, forcing them to wear yellow stars and limiting their freedom.

* Annemarie's family: We meet Annemarie's parents and her younger brother, Peter. They are a loving family, but concerned about the war's impact on their lives.

* The story's conflict: We are introduced to the conflict of the story - the Nazis are increasingly targeting Jewish people, and Annemarie's best friend, Ellen, is Jewish. This creates a sense of fear and uncertainty for both girls.

Overall, Chapter 1 sets the stage for the story, establishing the setting, characters, and conflict. It also highlights the growing threat faced by Jewish people in Nazi-occupied Denmark.