Central and state governments agree to share power
All I really know about Karl Marx is that he didn't like capitalism. So I would have to say the invention of capitalism.
In 139 B.C.E., the Chinese emperor dispatched Zhang Qian to central Asia to seek allies against the Xiongnu. The Xiongnu were a large confederation of Eurasian nomads who dominated the Asian Steppe.
In the 1930s, Germany first began to expand aggressively by
B. rebuilding the German military
they then joined forces with Italy
hope this helps