It is false that primary sources are the only sources that historians use, since it is important to consult the works of other writers and historians to get an idea of how events in history have played out. Historians usually use a combination of secondary and primary sources.
The name of the man who currently made the U.S. Flag is Robert G. Heft
Well the only constitutional change that resulted from the election of 1800 was the twelfth amendment requiring separate electoral votes for president and vice president. First election where both parties ran candidates and actually campaigned. There was a tie between Thomas Jefferson and Aaron Burr. Because of the election of 1800, the 12th Amendment was passed, making the ElectoralCollege simpler.
Im 99.9999999% sure it was at ft sumter