Historic resentments between ethnic groups, unjust governments, and regional rivalries.
The colombian exchange was the transfer of perople, plants, and products along with disease. The Colombian Exchange was so important because it marketed ideas, new foods and riches back and fourth.
Answer: Remus' twin brother Romulus killed Rumus.
Explanation: After being discovered by the sheepherder, Faustulus, and grown to adulthood, the twin brothers chose to build a city where the wolf had aided them. But, the pair quarreled about who had the assistance of the gods, and Romulus killed Remus in a fight on the places that became Palatine Hill.