What made americans so willing to engage in stock market speculation in the 1920s?

A.) People were in an optimistic mood, and they were willing to take a risk.

Explanation:

i just answered this question and it was right :D

puritans hope this

the answer is a. the harappan civilisation is also called the indus valley civilisation, this is because they built their cities along the indus river. the reason behind this location can be found in the rest of the "old world" civilisations like mesopotamia or egypt, the first built their cities along the rivers tigris and euphrates, the second along the nil; : their respective civilisations thrived because the overflowing of their respective rivers produced favorable conditions for agriculture, their main support.