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    Founding of the 13 American Colonies  
The Thirteen Colonies were the British Colonies on the Atlantic coast of North America founded between 1607 (Virginia) and 1733 (Georgia). Individual colonies began collaborating at the Albany Congress of 1754 to demand more rights and set...
 
    William Penn, Founder of Pennsylvania  
William Penn was an English real estate entrepreneur, philosopher, early Quaker and founder of the Province of Pennsylvania, the English North American colony and the future Commonwealth of Pennsylvania. He was an early advocate of democrac...
 
    Jeremiah Dixon, Mason–Dixon Line  
Jeremiah Dixon was an English surveyor and astronomer who is best known for his work with Charles Mason, from 1763 to 1767, in determining what was later called the Mason–Dixon line. Dixon was born in Cockfield, near Bishop Auckland, Cou...
 
    Robert Fulton, 1st Practical Submarine  
Robert Fulton was an American engineer and inventor who is widely credited with developing the first commercially successful steamboat. He also designed a new type of steam warship. In 1800 he was commissioned by Napoleon Bonaparte to desig...
 
    Hugh Glass, American Frontiersman  
Hugh Glass was an American frontiersman, fur trapper, fur trader, hunter, and explorer. Born in Pennsylvania to Scotch-Irish parents, Glass became an explorer of the watershed of the Upper Missouri River, in present-day Montana, North Dakot...
 
    James Buchanan, 15th US President, 1857-1861  
James Buchanan, 15th President of the United States (1857-1861). In the 1850s, the question of slavery divided the United States. Hopes ran high that the new President, "Old Buck," might be the man to avert national crisis. He failed entire...
 
    Solomon R. Guggenheim, Art Collector  
Solomon Robert Guggenheim was an American businessman, art collector, and philanthropist. He started collecting the old masters in the 1890's. He retired in 1919 to become an art collector. In 1926, he met Hilla Rebay. In 1930, they visited...
 
    Battle of Gettysburg, Civil War  
The Battle of Gettysburg, which took place during the American Civil War in and around the town of Gettysburg, Pennsylvania, was the largest battle ever fought in North America. The battle, which signaled a turning tide in favor of the Unio...
 
    George Marshall, Leader Allied victory in WWII  
George Catlett Marshall Jr. was an American statesman and soldier. He was Chief of Staff of the United States Army under presidents Franklin D. Roosevelt and Harry S. Truman, and served as Secretary of State and Secretary of Defense under T...
 
    Alexander Calder, Painter, Sculpter  
Alexander "Sandy" Calder was an abstract painter and sculptor famous for working in wire and originating the dangling, moving artworks known as mobiles. Alexander Calder grew up in a family of artists, but he began his career by studying me...
 
    B. F. Skinner, Radical Behaviorism  
Burrhus Frederic Skinner was an American psychologist, author, inventor, social philosopher, and poet. He was the Edgar Pierce Professor of Psychology at Harvard University from 1958 until his retirement in 1974. Skinner invented the operan...
 
    Richard Wurman, TED Conferences  
Richard Saul Wurman is an architect and graphic designer. He is considered a pioneer in the practice of making information understandable. He has written and designed over 80 books and created the TED conferences (with which he is no longer...
 
    Three Mile Island Accident, Nuclear Meltdown  
The Three Mile Island accident was a partial nuclear meltdown that occurred on March 28, 1979 in one of the two Three Mile Island nuclear reactors in Dauphin County, Pennsylvania, United States. It was the worst accident in U.S. commercial...
 
       
 
         
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