Adding -s is the most common. for example: books, cups, pencils, etc. -es might have been the one that confused you, but that isn't a super common ending for plurals--instead, a more common one would be "-ies" which is when you drop the y (berry becomes berries, for example).
Answer:
parent power school gives you all of the classes and everything
family sensei don't give you nun but one class
it became more prominent because the black power movement technically started the peaceful civil rights movement. Americans noticed that it wasn’t just the African Americans that needed independence, but other ethnicities (bringing peace to all)
