What resources are available to people living in North America and how do people earn their living?
We have
space
minerals
arable land
rivers and lakes
adequate precipitation in most places
People make their livings by providing services, sales, engineering, government, etc.
Check these sites for more information.
https://www.cia.gov/library/publications/the-world-factbook/geos/ca.html#Econ
https://www.cia.gov/library/publications/the-world-factbook/geos/mx.html#Econ
https://www.cia.gov/library/publications/the-world-factbook/geos/us.html#Econ