The U.S. wanted to prevent the spread of communism.
The opinions and prejudice of an author in writing.
I believe that those two elements greatly affect bias in history because we can never be 100% sure of everything that (may have) happened in history (especially farther in the past), so opinion can affect a historian's writings. Also, everyone is prone to some sort of prejudice, so this can also affect history.
The sea served as anchient Greece's highway because it was the fastest way to get around
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The Polarstern will enter an ice floe and and establish research outposts on surrounding ice sheets to study climate change at the North Pole.
I already answered this. I believe you’ve posted the question more than once.
It gives meteorologists a visual. With maps they can demonstrate what they are trying to show.
