Agreed. This test is not reasonable.

Even "who is the first president" knowledge shouldn't be a bar to voting. Do you think they offered this literacy test in the native languages of all taking it? Do you think all people in the US had the opportunity to learn, in their language, the history of the country?

At the time there were systemic barriers to education that meant that many folk were probably not even taught who the first president was. Let alone how old you have to be to be president.