What was the name of royal statement that allowed British and French way life it Biculturalism?

There is no such royal statement that allowed the British and French way of life in Biculturalism. Do you mean the Royal Proclamation of 1763? This proclamation was issued by King George III of Great Britain following the British victory in the Seven Years' War. It outlined the British government's policies for governing its newly acquired territories in North America, including the rights of French settlers living in those territories.