Answer:
On September 1, 1939, German forces under the control of Adolf Hitler bombard Poland on land and from the air. World War II had begun.
Step-by-step explanation:
1939 Germany and the Soviet Union attacked Poland and Britain, France, India, Australia and new Zealand declared war on Germany on September 3rd , the United States decided to remain neutral but did begin rearming for war , which helped end the great depression.