Archaeological evidence shows that approximately in the year 500 B.C. the Adena culture built cities and funerary mounds in the Midwest. For the year 100 B.C. Hopewell culture-related societies massively built mounds of land to bury their dead and other ceremonial purposes. Frequently these mounds had animal shapes and geometric figures that reflected aspects of their cosmogony. Some mounds reach 20 meters high.
There are different protocols for archaeological research depending on the nature of the site or the objective sought. Archaeologists can find out about this information after carrying out excavations in which they found the skeletal remains next to the objects that accompanied the bodies of dead people. They measured the depth of the findings and analyzed all material remains. To know the dates they used different techniques and dating methods such as “carbon 14”.
One of the first cash crops that Europeans brought back from the tropical climates of Southeast Asia was "coffee". Coffee was in high demand because it had sparked a European revival of ideas and enthusiasm.
The USA became involved in Vietnam because it feared the spread of communism. The United States got involved in the Vietnam conflict to keep communism from spreading throughout Southeast Asia.
