Aztec, New Mexico, UFO incident concerning the memo. In addressing the memo's context and possible connection to a hoax, the Bureau wrote, "Finally, the Hottel memo does not prove the existence of UFOs; it is simply a second- or third-hand claim that we never investigated. Some people believe the memo repeats a hoax that was circulating at that time, but the Bureau’s files have no information to verify that theory." The incident gave birth to the Aztec UFO Symposium, which was run by the Aztec, New Mexico library as a fundraiser from 1997 until 2011. Aztec, New Mexico, UFO incident The Aztec, New Mexico, UFO
Global silver trade from the 16th to 18th centuries Global silver trade from the 16th to 18th centuries The global silver trade between the Americas and Europe from the sixteenth to nineteenth centuries was a spillover of the Columbian Exchange which had a profound effect on the world economy. In fact, many scholars consider the silver trade to mark the beginning of a genuinely global economy, with one historian noting that silver "went round the world and made the world go round." Although global, much of that silver ended up in the hands of the Chinese, as they accepted it as a form of currency. In addition to the