More like: of the 19th Century (Clemens died in 1910, and was not very productive in his waning years).
And some argue that the 20th Century - the "Short Century" - began properly in 1914, and ended in 1989.
Regards,
I’ve never heard the “short century” thing. I take it the brackets are WW1 and the *real* end of WW2 - the fall of the USSR. I’ll have to think about that.