1890s: Economic depression in the United States helps to spark a mass movement toward economic and social reform known as the Progressive movement.

1930s: Just months after the publication of Lippmann' s A Preface to Morals, the stock market crash of 1929 begins the Depression era in the United States. Increased production as a result of Europe's entry into World War II lifts the United States out of the Depression.

1990s: The United States enjoys a period of economic prosperity characterized by low unemployment as well as many average Americans profiting from stock market investments.

1914-1918: World War I breaks out in Europe. The United States enters the war in 1917, helping to turn the tide in favor of the Allied forces. The postwar peace negotiations are made in 1919 at the Paris Peace Conference. Lippmann attends the Paris Peace Conference as a member of President Wilson's...