the economy and environment were entangled and have to be regarded together. By that we do not mean the natives in North America relationship with the natural environment, even though also fascinating, but rather the way they lived. In many Indian settlements became more concentrated over time because it was mostly corn that was grown, the problem was through this new structure of the economy, not only altered the social life but also their vulnerability to diseases. This is nicely established in Paul Keltons 2007 book Epidemcis and enslavement, once the British came, the diseases spread much more rapidly. Hence for environmental historians, the change in the economy made the spread of environmental factors way faster