The reason for the Great Depression to begin was... a

the election of 1776.
b

due to domestic and worldwide conditions.
c

people in Russia changed their country to the USSR.

B due to domestic and worldwide conditions.

Explanation:

It began after the stock market crash of October 1929, which sent Wall Street into a panic and wiped out millions of investors. Over the next several years, consumer spending and investment dropped, causing steep declines in industrial output and employment as failing companies laid off workers.As the Depression worsened in the 1930s, many blamed President Herbert Hoover