The mogollonian became sedentary due to the fact that the irrigation technology was discovered and applied in their land. Normally, the use of physical hand in farming and applying water in the farm has always been part of their lifestyle. <em>But when they discovered that, there are simpler ways to apply water in same farmland, they adopted such thereby making their farming much easier.</em>
C) a unified European currency did not come about until the creation of the Euro -- instituted as an "invisible" currency in 1999 for trading but not available for common use (i.e., as a physical currency) until 2002.
throughout the 1930s Britain and france let hitler do what he wanted hoping he would stop making demands and war would not happen. This policy is known as appeasement
