Dictatorship would have supreme leader
<span>provoked by a treaty-violating ultimatum to surrender their sacred Black Hills (Paha Sapa), where an expedition under Custer discovered gold in 1874. In June 1876, driven by converging army columns, a unique concentration of Sioux and Cheyenne/Arapaho in southern Montana first repulsed a 1, 000-man column under Crook at the Rosebud and then destroyed Custer's command at Little Bighorn. </span>
A. Muslim mathematicians introduced algebra into the world
is correct - that is the reason why the number system we use today is the Arabic Numericals.
B. Ibn Sina collected medical knowledge into a book that was used for centuries in Europe
is correct - that books is called The Canon of Medicine.
Answer: D
Explanation:
Africa traded slaves. America traded sugarcane. Europe also provided trade.
