Name the event in the US that prompted the Great Depression around the world

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.

Explanation:

the transatlantic slave trade radically impaired africa's potential to develop economically and maintain its social and political stability. the arrival of europeans on the west african coast and their establishment of slave ports in various parts of the continent triggered a continuous process of exploitation of africa's human resources, labor, and commodities. this exploitative commerce influenced the african political and religious aristocracies, the warrior classes and the biracial elite, who made small gains from the slave trade, to participate in the oppression of their own people. the europeans, on the other hand, greatly benefited from the atlantic trade, since it allowed them to amass the raw materials that fed the industrial revolution to the detriment of african societies whose capacity to transform their modes of production into a viable entrepreneurial economy was severely halted.

i think it was   tsar alexander ii