I used \bibliographystyle{apacite} and gives me the following reference:
Herfindahl, O. (1950). Concentration in the u.s. steel industry [Unpublished doctoral dissertation, Columbia University].
In the reference, "u.s." should be capitalized . How can I capitalize "u.s"? I notice that \bibliographystyle{apacite} does not capitalize the words in a title of a journal that should be capitalized. There are cases where it capitalizes the wrong word. How to do deal with such issues? In fact, it capitalizes a word after : in the title of an article.
title = {Concentration in the {U.S.} Steel Industry},. See https://tex.stackexchange.com/q/10772/35864. (It is APA style to use sentence case in article titles, but you have to protect words that must not be converted to lower case such as "U.S." or other abbreviations as well as proper nouns.) – moewe Jun 22 '19 at 15:10