Yes, the US Constitution filters down. Part of it reads:
This Constitution, and the Laws of the United States which shall be made in Pursuance thereof; and all Treaties made, or which shall be made, under the Authority of the United States, shall be the supreme Law of the Land; and the Judges in every State shall be bound thereby, any Thing in the Constitution or Laws of any State to the Contrary notwithstanding.
Not from the USA.
Doesn’t the 1st apply to federal congress? Does it filter down to state legislatures?
Depends on the judge and the day of the week. They change established precedents and text interpretations, more often than people change their socks.
Yes, the US Constitution filters down. Part of it reads:
That is known as the Supremacy Clause.