Title: Law of the United States.
Question: What are the 50 states in the Union known as?

Title: Age of Enlightenment.
Question: Who wrote a successful natural history textbook for children titled The Easy Introduction to the Knowledge of Nature (1782)?

Title: Gramophone record.
Question: What magazines provided reviews for audio equipment?

Title: Indigenous peoples of the Americas.
Question:
What feature did the music of Central America have?