Data for 1848

After New York Herald breaks the news on gold in California in August 1848, adds such as this become a regular feature in newspapers

The California Gold Rush begins (Jan 24), Mexico cedes most of what becomes the future Southwestern United States to the U.S. (Feb 2), Marx and Engels publish The Communist Manifesto in London (Feb 21), the Hungarian Revolution begins (Mar 15), the German Revolutions culminate in Berlin (Mar 18), the Swiss Federal Constitution enters into force, creating one of the first modern democratic states in Europe (Sep 12),