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The history of syphilis has been well studied, but the exact origin of the disease remains unknown. [3] It appears to have originated in both Africa and America. [4] [5] As such, there are two primary hypotheses: one proposes that syphilis was carried to Europe from the Americas by the crew(s) of Christopher Columbus as a byproduct of the Columbian exchange, while the other proposes that ...
Fort Hill, photographed in 1887, was the home of John C. Calhoun and later Thomas Green Clemson and is at the center of the university campus.. Thomas Green Clemson, the university's founder, came to the foothills of South Carolina in 1838, when he married Anna Maria Calhoun, daughter of John C. Calhoun, the South Carolina politician and seventh U.S. Vice President. [15]
The first documented use of the phrase "United States of America" is a letter from January 2, 1776. Stephen Moylan, a Continental Army aide to General George Washington, wrote to Joseph Reed, Washington's aide-de-camp, seeking to go "with full and ample powers from the United States of America to Spain" to seek assistance in the Revolutionary War effort.
Andrew Carnegie founded the Carnegie Steel Company and Charles M. Schwab founded Bethlehem Steel. Other industry titans, including John D. Rockefeller and Jay Gould , operated in the state. In the latter half of the 19th century, the U.S. oil industry was born in western Pennsylvania, which supplied the vast majority of kerosene for years ...
No one knows why the Angel Mounds civilization declined, but scholars have speculated that an extended regional drought or over-hunting may have been contributing factors. [2] Archaeologists theorize that with the collapse of the chiefdom by 1450, many of the Angel people had relocated downriver to the confluence of the Ohio and Wabash Rivers.
Its main occupation was from 1250 to 1550 CE. It was a ceremonial center for the Pensacola people, and a gateway to their society. This site would have had easy access by a dugout canoe, the main mode of transportation used by the people; they traveled primarily by the waterways rather than through the thick vegetation. [9]
An OH-58D Kiowa helicopter departs from a communications site in the desert during Operation Desert Shield. The primary combat vehicles of the American divisions were the M1A1 Abrams tank and the Bradley Fighting Vehicle. [190] The primary American artillery system was the self propelled M109 howitzer. [191]
USS United States, the first of the original six frigates of the United States Navy, seen here defeating HMS Macedonian in battle, before taking her as a prize during the War of 1812 USS Gerald R. Ford, as of 2018, is the US Navy's latest and most advanced nuclear powered aircraft carrier, and the largest naval vessel in the world.