How did a surplus of food affect the development of civilizations?

15 points to the "charlemagne" section, what were the two policies that charlemagne implemented when he took the throne? what was the result of the policies and how did it impact his warriors?

Which of these constitutional amendments made all people born or naturalized in the united states into citizens of the united states ?

During the 1920s, many people looked for ways to maintain traditional social order as the nation rapidly moved into a new, modern era. which groups or types would most likely be in this category?