I believe that the answer to the question provided above is because of industrial revolution US shipping industry flourish in the late 1700's
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The answer is a. A day with the shortest or longest amount of sunlight
You're talking about World War II, right? Well, yeah, at one point Germany attempted to invade the Soviet Union (specifically during the Battle of Stalingrad.) But a major stumbling block was the weather in the Soviet Union; it was fiercely cold and German soldiers were starving and sick. Eventually, it became so cold that the German military retreated and Hitler's plans for "world domination" officially ended.
2.5m years ago
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Machine Guns, The USS Monitor, Fenian Ram, The Maxim Gun, The First Bulletproff Vest Made Of Heavy Metal Plates, Gun Silencer, First Tanks, Nuclear Bombs, The Laser Is Demonstrated For The First Time,