Because they knew that Germans could sink any ship they want. They could sink civilian ships. Back then, the only way to travel long distances was by boat, because passenger airplanes had not been invented. The Germans could now sink them if they wanted to travel somewhere, so they either risk their life or not go on trips.
Some of the best definitions of globalization are:
globalization is a term that is used to refer to the increased interdependence among nations. It is a process by which people, nations, and companies interact actively in the international stage. Globalization refers to the shrinking of the world political,economic and social structures into one village.
Honestly, I would choose A & B because after WW2 the U.S. economy was the best in the entire world. But B would be the answer. Because the U.S. had military bases all over the world and needed troops to man it.
Hitler invaded Poland on September 1st, 1939
