Answer:
Hitler's invasion of Poland in September 1939 drove Great Britain and France to declare war on Germany, marking the beginning of World War II.
Answer:
In chapter three Heidi goes with Peter, the goatherd and the goats to the pasture. Heidi and Peter are starting to become friendly with each other.
Explanation:
She has been lonely and she thought that she had been put at the end of the world with no one and nothing to do in life. She meets Peter and learns about the goats/goatherd and realizes that she can have something in common with him - her grandpa's goats.