Because they were just now looking in the anatomy of the human body and the first vaccines were made
The different cultures were established in Asia and carried into the Americas. B. Constant warfare among the different Native American groups led to cultural differences.
I think it was in 1964, that was when direct army confrontation happened. This was followed by several more conflicts that made use of heavy fighting naval and aircraft with the Gulf of Tonkin resolution that made military measures necessary. There were an estimated 40, 000 deaths and 20, 000 other casualties.
Answer: In 1884, the Berlin Conference was convened to discuss African colonization, with the aim of setting up international guidelines for making claims to African land to avoid conflict between European powers.
So B. European imperialists in Africa