Compulsory Education Act Nationally

Let's say the United States doesn't rule the Oregon compulsory education act as unconstitutional. Instead other states end up passing similar laws across the United States until it is eventually passed on a federal level across the United States. The United States rules religious/private education with the exception of military schools are a violation of the separation of church and state. This bans religious education and schools within the United States. What would be the impact of this?
 
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