Respuesta :
After Germany invaded Poland. The prime minister declared war on September 3, 1939.
Answer: Germany invaded Poland
Explanation: The Second World War officially began when Germany invaded Poland on September 1, 1939. After two days, more precisely on September 3, British Prime Minister Chamberlain sent an ultimatum through his ambassador to Germany demanding that German troops withdraw from Poland. Since this did not happen, Britain declared the war on Germany. In this way, France acted with the same request, which was not done by Germany, so France declared the war against Germany.