Who became president after John F. Kennedy was assassinated?

Lyndon B. Johnson

Which chess title is given by FIDE recognized globally as the highest? Who killed Supreme Leader Snoke? During which war was the Battle of Midway fought? Who founded the one-time successful 'New Harmony' utopian community in Indiana in 1825? What is the mathematical term for a repeating pattern that continues endlessly without gaps or overlaps?