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The Stone Age was a broad prehistoric period during which stone was widely used to make tools with an edge, a point, or a percussion surface. The period lasted for roughly 3.4 million years,[1] and ended between 4,000 BCE and 2,000 BCE,[citation needed] with the advent of metalworking.
They became rivals because each one wanted more power than the other for example in world war 2 the USA made the atomic bomb which showed the world that the Americans were the most powerful country but after ww2 Russia and USA started a Cold War which lead to the feud between there political views and the start of better technology and the space race
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Britain's blockage across the nothern sea and the English Channel cut the flow of war supplies, food and fuel, to Germany during WW1. Germany replied by destroying ships that were supplying the material. In the end of the war all the submarines the German used impacted the war. German submarines sank a total of 6,394 marines displacing a combined total of 11,948,702 tons. Reciprocating 229 submarines for an average of nearly 52,000 tons sunk per submarine.
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