Frederick Douglass's perspective on the question, "who is an American?" was considered radical for the time because He believed people of all races and national origins could become good Americans.
Frederick Douglass was known to be famous as he was once an enslaved man who was said to have became a widely known activist, author as well as a public speaker.
He was also known to be a leader in the abolitionist movement, that fought for the end to slavery, before and in course of the Civil War.
Note that people often tends to misinterpret what others say even if the heart of the people are pure.
Therefore, based on the above, Frederick Douglass's perspective on the question, "who is an American?" was considered radical for the time because He believed people of all races and national origins could become good Americans.
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He believed people of all races and national origins could become good Americans.
He believed only those born in the United States should be afforded the rights of American citizenship.
His views foreshadowed the Chinese Exclusion Act of
1882.
He supported the deliberate exclusion of Chinese immigrants from American society.