Title: Bras%C3%ADlia.
Question: How many vendor spaces are in Brasilia's airport?

Title: Child labour.
Question: If not forced why did children work?

Title: Seven Years%27 War.
Question: What was the reason that the British Prime Minister thought that ware in Europe could be prevented?

Title: Law of the United States.
Question:
What is a law enacted by Congress that states that it refuses to regulate some industries as long as the states have regulations in place already?