Which historical detail best clarify a reader’s understanding of the information in the excerpt? female factory workers had to work long hours, sometimes up to eighty hours a week. many union men believed that women factory workers would never come together to strike. women’s clothing first began to be mass produced in the early twentieth century. “gorillas” were men who were hired to threaten and harass striking factory workers.

Female factory workers had to work long hours, sometimes up to eighty hours a week.

Explanation:

in order to better understand the document, the historical detail that female factory workers had to work long hours, upto 80 a week helps better understand why would they strike and ask for better working conditions and better wages, this is important because you can see that they were workin 12 hours a day if they worked all 7 days of the week, if they for some reason had one day off, they´d be working for 15 hours a day.

the underlined phrase is an example of : understatment