Here are some examples:
* Pre-Columbian
* Anti-American
* Mid-Atlantic
* Pro-Russian
* Non-European
However, there are some exceptions to this rule:
* When the prefix is "un-" or "non-" and the proper noun or adjective starts with a vowel, no hyphen is needed. For example, "unAmerican" and "nonEuropean."
* When the prefix is "co-" and the proper noun or adjective starts with a vowel, no hyphen is needed. For example, "coeducational."
It's always best to consult a dictionary or style guide if you are unsure whether or not to use a hyphen.