What is Black Tuesday and why does it mark the beginning of the Great Depression?

you basically answered your own question but OK.

Explanation:

October 29, 1929. On this date, share prices on the New York Stock Exchange completely collapsed, becoming a pivotal factor in the emergence of the Great Depression.

The DJIA fell 12%, one of the largest one-day drops in stock market history. More than 16 million shares were traded in the panic sell-off, which effectively ended the Roaring '20s and led the global economy into the Great Depression.

i believe that the correct answer is a canadian hero.

explanation: he is celebrated as a national hero in canada for successfully thwarting a united states takeover of canada during the war of 1812.

this is true many people think today that blacks should be slaves also known as rasisim calling them many insults from slavery the idealogy of the south still exsist in some parts but not all