when did we go from bc to ad
Anno Domini This calendar era is based on the traditionally reckoned year of the conception or birth of Jesus of Nazareth, with AD counting years from the start of this epoch, and BC denoting years before the start of the era. There is no year zero in this scheme, so the year AD 1 immediately follows the year 1 BC. This dating system was devised in 525 by Dionysius Exiguus of Scythia Minor, but was not widely used until after 800.[9][10]
History of advertising In the United States around 1840, Volney B. Palmer set up the first advertising agency in Philadelphia. In 1842 Palmer bought large amounts of space in various newspapers at a discounted rate then resold the space at higher rates to advertisers. The actual ad – the copy, layout, and artwork – was still prepared by the company wishing to advertise; in effect, Palmer was a space broker. The situation changed in the late 19th century when the advertising agency of N.W. Ayer & Son was founded in New York. It planned, created, and executed complete advertising campaigns for its customers. It created a number of memorable slogans for firms such as De Beers, AT&T and the U.S. Army.[12]