Subsistence agriculture occurs when farmers grow food crops to feed themselves and their families. In subsistence agriculture, farm output is targeted to survival and is mostly for local requirements with little or no surplus trade.
Vernacular is called pidgin laungage
They lived in the north and didn't rely on slaves for they're income.
Answer: oil
explanation: in canada and the us it is written that oil is found within the list of resources, but is missing in the list for mexico.