The US purchased the Florida Territory from Spain... i think that was in 1819
The development of irrigation systems made farming easier, as water was more easily accessible to crops. This meant that food could be produced more efficiently. More efficient farming techniques meant that food was more plentiful, where people weren't constantly scrambling for their next meal or going days without eating. It also gave people the ability to specialize in certain trades, creating better quality of goods and advancing technology in civilizations.
I think Darius created a fairer system in which each province paid according to its wealth. <span />
The Reasons for the migration of the Bantu are not known but they most likely included the following, they moved due to the fear of famine, which broke out due to overcrowding and drought. The climate in their cradle land had become unreliable/unpredictable.
Simon bolivar lead the revolution to gain freedom for the republic of colombia. he was the first presedient of colombia
hope this helps
