Every public school classroom in Louisiana has been ordered to display a poster of the Ten Commandments – a move that civil liberties groups say they will challenge. The Republican-backed measure is the first of its kind in the US, and governs all classrooms up to university level. Governor Jeff Landry signed it off on Wednesday. Christians see the Ten Commandments as key rules from God on how to live.The new law describes them as “foundational” to state and national governance. But opponents say the law breaks America’s separation of church and state.The first amendment to the US…