Which geographic features gave rise to early civilization?

What led to the environmental damage that caused the dust bowl? 1. desert winds emerging from the southwest 2. rotating crops every year and having fallow land 3.overplanting throughout the great plains 4.a year-long drought

Ilive in michigan i went to iowa and killed someone i then went to florida for vacation i got caught for the iowa murder wile kicking back on the beach in miami where will i be tried

What would be considered a secondary source about the assasination of abraham lincoln