Who were the Molly Maguires in the Pennsylvania anthracite coal mines?

President William Henry Harrison died in 1841 after only 31 days in office. James A. Garfield was a close second. In 1881, he died of a gunshot wound after only six months in office.

Theodore Roosevelt was the youngest man to become president of the U.S. Roosevelt was a 42 year-old vice president when he took office upon the assassination of President William McKinley in 1901. At 43, John F. Kennedy was the youngest man to be elected president.

The term “manifest destiny” appeared in an article by John L. O’Sullivan in the July-August 1845 United States Magazine and Democratic Review. In the article, O’Sullivan said it was “our manifest destiny to overspread the continent allotted by Providence for the free development of our yearly multiplying millions.”

Thomas Jefferson said, “A little rebellion now and then is a good thing”, writing from Paris on hearing of Shays’s Rebellion, an uprising of poor farmers against the Massachusetts state government in 1786. Jefferson added, “God forbid that we should ever be twenty years without such a rebellion.”

The “Mexican cession” was the territory Mexico called the “Far North,” including what are today California, Nevada, Utah, most of New Mexico and Arizona, and parts of Wyoming and Colorado. In return Mexico received $15 million, was set free of $3 million in American claims, and got rid of American forces occupying its capital. The…

Charles F. Richter of the California Institute of Technology developed the Richter scale in 1935 as a mathematical device to compare the sizes of earthquakes. Each whole number increase in the scale corresponds to a tenfold increase in the amplitude of waves measured by a seismograph, or an increase of about 31 times the energy…