A star's death method is determined by its mass. A star with a mass under 4.2 times the mass of the Sun (called the Chandrasekhar limit after the University of Michigan astronomer who first determined it) will wind up a white dwarf and ultimately burn out as a heavy but small, dense object.
<span>More massive stars will become white dwarfs, neutron stars, novas, supernovas, black holes, depending on a variety of factors, including mass and the presence of a close stellar binary companion</span>
He was the running mate of Dwight D. Eisenhower, the Republican Party presidential nominee in the 1952 election. Nixon served for eight years as Vice President, becoming the second-youngest vice president in history at age 40.
The primary way in which Shay's Rebellion showcased the economic issues of the age was that it proved that the federal government lacked any adequate means to put down the rebellion, and that there was no central system of taxation, which was needed to pay of war debts.
Monroe Doctrine--This doctrine was announced in 1823 as a statement to Europe that they were no longer welcome in the Western Hemisphere as colonial holders.
Following the American Revolution and those of Mexico, Haiti, and South America, European countries had been almost completely pushed out of the Western Hemisphere. James Monroe announced his doctrine in 1823, stating the US would assist any country who had their independence threatened. This was to ensure the freedom of these new countries.
Before, trains, cars, airplanes and trucks existed, rivers were used for travel. They carried people and goods. However, this way of transportation was very slow. All that changed with the arrival of the steamboat in the late 1700s and early 1800s. The steamboat could travel at the amazing speed of 5 miles per hour. It soon changed all over river travel and trade and dominated the waterways.
