That the earth is round in shape
I believe it was the Jewish people.
Explanation:
During that time, the Mongol system was to place Vassal princes who were expected to pay tribute to the Mongols for the privilege of holding their own kingdom (Roy 8). The result was harsh rule that turned most Russians into serfs and destroyed the Russian economy, most importantly in regard to trade (Hopkik 12).
Karl Marx predicted that Laidsez-faire capitalism would result in an equal distribution of wealth and income
More work needed which ment more jobs