What is associated with: 1920 calvin coolidge?

What is associated with: 1918 no 2 absolute freedom of navigation upon the seas outside territorial waters? What is associated with: 1919 and sixpence? Based on the clue '192 people were killed trying to cross this infamo...', what is the answer? What is associated with: 1920 by eugene oneill? What is associated with: 1920 gopher prairie? What is associated with: 1920 painting by george grosz shows one of these machines karel capek named the next year? What is associated with: 1920s art deco architecture is exemplified by this new york building on the stamp seen here? What is associated with: 1920s buses from safety coach lines of muskegon mich were known as these because of their colo…