All languages exhibit internal variation, that is, each language exists in a number of "varieties and is in one sense the sum of those varieties."
Explanation:
The statement above is made by Ronald Wardhaugh in his book titled "An Introduction to Sociolinguistics." In the statement, Ronald Wardhaugh is trying to illustrate the fact that any language itself can be perceived as a variety of human languages.
A colon is used to demonstrate a list. In this case, you are listing the places where funding for libraries is not prioritized. Thus, it would be appropriate to insert a colon before it.
