Ead the quotation from "To the King's Most Excellent Majesty." "And may each clime with equal gladness see A monarch's smile can set his subjects free!" Wheatley uses the word free in these lines to suggest that

Subjects could live without being governed.

Explanation:

Free in the line suggests that the 'subjects' which refers in this poem to people governed or ruled by another, in this context by "the king; could be released or liberated, and could live without any rules or without being governed.