Final answer:
During the Great Depression, the unemployment rate reached its peak at 25%. This was a time of extensive economic struggle, with industrial and financial sectors experiencing massive downturns.
Step-by-step explanation:
The highest percentage of unemployment during the Great Depression was 25%. This period of economic hardship saw a significant impact on industrial output, the stock market, and the overall gross domestic product of the United States. By 1933, around one out of every four American workers was jobless, emphasizing the severity of the Great Depression's impact on the labor force.