What countries declared war on Germany World War 2?

During World War II, several countries declared war on Germany following its aggressive expansion. The United Kingdom and France were the first to declare war on Germany on September 3, 1939, after the invasion of Poland. Subsequently, other countries, including Australia, New Zealand, and Canada, also declared war in support of Britain and France. Additionally, the Soviet Union and the United States later entered the war against Germany after various provocations and alliances shifted.