This Day in History: 0000-12-07
7 Dec – The Royal Opera House, the third theater on the site, opened in Covent Garden, London (1732).
7 Dec – Delaware became the first state to ratify the new US Constitution (1787).
7 Dec – Japanese naval and air forces under Isoroku Yamamoto attack the US Naval base at Pearl Harbor (1941).
7 Dec – Greek Orthodox Patriarch Athenagoras I and Roman Catholic Pope Paul VI mutually lifted the orders of excommunication that were written in the Great Schism of 1054 (1965).