The correct answer is Italy invades Ethiopia
The Fall of Nanjing happened in 1938 after a four months battle. Sudetenland was also annexed by Hitler in 1938. Invasion of Ethiopia happened during the Second Italo-Ethiopian war in 1935, which is 3 years before the other two events, even though the war with Ethiopia did last until 1939, which is four years after the invasion began.
The US was the most productive country in the world. It produced many things and needed to sell them.
The Air battle above the English Channel to prepare for an invasion of Britain is the best describes the Battle of Britain. it is famously known as the Air battle for England where Royal Air Force defends against the German Air Force which began at the end of June 1940. The British and German air forces clashed in the skies over the United Kingdom and the battle ended when the Germany failed to gain air superiority over the Royal air force despite months of targeting Britains air bases, military post and civilian population.
In a closed primary you can only vote for someone in your registered party. In an open primary anyone can vote for any candidate in either party regardless of whether they are registered democrat or republican
Hope this helps :)