The World Almanac and Book of Facts is a US-published reference work, an almanac conveying information about such subjects as world changes, tragedies, and sports feats. It has been published yearly from 1868 to 1875, and again every year since 1886.
The first edition of The World Almanac was published by the New York World newspaper in 1868 (the name of the publication comes from the newspaper itself, which was known as the World). Published just three years after the end of the US Civil War and the assassination of President Abraham Lincoln, its 120 pages of information touched on such events as the process of Reconstruction and the impeachment of President Andrew Johnson.
Publication was suspended in 1876, but in 1886, newspaper publisher Joseph Pulitzer, who had purchased the World and quickly transformed it into one of the most influential newspapers in the country, revived The World Almanac with the intention of making it “a compendium of universal knowledge.” The World Almanac has been published annually since.
During World War II, The World Almanac could boast that it was read by GIs all over the world: between 1944 and 1946, at the request of the U.S. Government, The World Almanac had special print runs of 100,000 to 150,000 copies for distribution to the armed forces.
In the mid-1980s, The World Almanac was being put together by a 10-member staff. At that time, 20 percent of the book was rarely updated (for example, the text of the Constitution of the United States), 50 percent was updated at least briefly each year, and 30 percent of the content was completely new each year.
According to en.wikipedia.org; amazon.com.