I believe it's <span>B.Researchers everywhere began to collaborate and share data.
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The Iron Curtain referred to countries that Russia took over and acted as a buffer between Western Europe and Russia. Those nations included any country ending with -stan, Latvia, Estonia, and Yugoslavia.
The Russian Revolution was actually a series of two revolutions that took place in 1917. The February Revolution resulted in the overthrow of Tsar Nicholas II and the establishment of a provisional government. The October Revolution brought the Bolsheviks to power.Answer:
Explanation:
Bartolomé de las Casas wrote it in 1552.