YSK You aren’t supposed to use apostrophes to pluralize years.
It’s 1900s, not 1900’s. You only use an apostrophe when you’re omitting the first two digits: ‘90s, not 90’s or ‘90’s.
Why YSK: It’s an incredibly common error and can detract from academic writing as it is factually incorrect punctuation.
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Same when you pluralize an initialism or acronym. ATMs not ATM's. Unless it is needed for clarity. If you had the acronym "AS" you might choose AS's instead of ASs.
Why would you not choose ASs?
Dunno, I'm an ASs man, myself.