Hey there! I believe your answer is
the late 1960s. MLKjr gave his speech in 1967, which in turn is apart of the late 60s era. Hope this helped!
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~Steve
I like the manga's "angels of death" and "demon slayer" (you probably already know demon slayer if you like manga/anime). angels of death is a good manga, though it has a lot of blood in the anime. Also, it might get a bit boring.
Answer:
This quote means that the person who wrote this quote doesn't think very highly of himself, and he says that what he has accomplished was because of his own hard work.