Why did douglass advocate so vigorously for black men to be allowed to fight

Douglas believed that black men should fight because they were slaves and nothing good would come to them without the fight.

Explanation:

Frederick Douglass was an American abolitionist, suffragist, editor, speaker, author, statesman, and reformer. Called “The Sage of Anacostia” and “The Lion of Anacostia,” Douglass is one of the most prominent figures in the history of African Americans and the United States.

Douglass and the Abolitionists argued that because the aim of the war was to end slavery, African Americans should be able to fight for their freedom, because neither lewdness nor good would happen to slaves without a great struggle. He published this opinion in his newspapers and in his various speeches.

on november 6 and 7, 1917 (or october 24 and 25 on the julian calendar, which is why the event is often referred to as the october revolution), leftist revolutionaries led by bolshevik party leader vladimir lenin launched a nearly bloodless coup d'état against the duma's provisional government.