The answer is: to act as a ceremonial role within the Senate.
The phrase 'Pro Tempore' is a latin language with the meaning of 'for the time being'. President pro tempore of the senate only elected as a ceremonial role when the actual presiding officer of the senates is unable to attend the meeting/conference.
I think he assisted in developing NATO, which helped Western Europe rebuild after the war. He created the Marshall Plan, which provided economic support for war-torn regions. He helped stop the spread of communism in Western Europe.
Trench Warfare was a form of military conflict in which opposing sides fought one another from trenches facing one another. WW1 warfare introduced the first large-scale use of chemical weapons as well as bringing in airplanes and tanks for the first time.
Answer:
They earned money from colonization, so it mainly became a battle of how rich they were. And then the exploration part pretty much meant that they could claim 'new' land (that was already pretty much discovered by Native Americans) and make even more money, along with having power in the New World.
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