What geographical feature might have isolate the incans

The answer is The Andes Mountains. :)

well first we can compare on what the slave masters ate and what the slaves ate well the masters ate fancy great food like chicken rice mash potatose and stuff like that and slaves ate well food that your not suppost to eat like the weird parts of turkey and chicken and slaves master chilled beat and eat and slaves work get beat and get little of sleep there you go

very positive impact on our industries in the west, sine they promoted settlement and increased the ways in which goods could be transported to market.