Hyphen Between A Prefix And A Capitalized Word

If you’re adding a prefix to a proper noun, keep the capital on the proper noun. There’s no need to capitalize the prefix unless it’s at the beginning of the sentence.

Mark is reading a book on pre-Civil War Argentina.

The post-WWII housing boom is still evident today in most towns and cities.

One does not need to be anti-American to be pro-Canadian.

Anti-Semitism is a major motif in Shakespeare’s The Merchant of Venice.

The prefix anti- is capitalized because it’s at the beginning of the sentence.