What are the differences and similarities between the emergence of classical civilizations in Africa and America?

Ancient America was home to sophisticated civilizations such as the Maya, Inca, Olmec and Aztec societies, and mysterious ruins like Chichen Itza, Teotihuacan, Serpent Mound, Tikal, Machu Picchu and the Nazca Lines.

Ghana dominated the region between about 750 and 1078. Smaller states in the region at this time included Takrur to the west, the Malinke kingdom of Mali to the south, and the Songhai Empire centred on Gao to the east.

although the crusades failed to capture jerusalem, they had several major impacts on western europe. they increased the authority of the king: sometimes nobles died in battle without leaving an heir in which case the king got their land. kings passed taxes to pay for the crusades.

which statement explains one of the reasons world war 1 was so much more destructive than earlier conflicts