I'm not sure what your point is here? 4th or 5th is not very close to being largest (especially amongst cities which tend to have exponential curves in population - e.g. it's not surprising the 1st most populous city to be 3-5x the next largest)
b) Choose the incorrect decade for peak population with respect to the size of other cities in the US.
c) Gave a snide remark to the user to use Wikipedia while unable to do so themselves...
[Edit rate limited reply] Well I guess you learn something new everyday, but the parent insinuated the poster did not know this to be the case with the BTW, so you can read it however you'd like