Answer:
B
Explanation:
The answer is B because they had a highly advanced numeral system with place values. Maya mathematics were also far ahead of Europe for many centuries.
The Great Depression happened
Cause they thought it was a good idea
Eli Whitney inventing the cotton gin which separated cotton seeds from their fiber and also increased the cotton supply in the south. Another event is the first national road to link parts of the country together to transport and increase trade throughout the United States.
I'm pretty sure It would be Heros, Or Heroines