The Pennsylvania Historical -and- Museum Commission provides a potted history of early European contact with the Delaware, Susquehannock and Monongahela tribes in the period from 1500-1763 here:
http://www.portal.state.pa.us/portal..._period/407008
[compiled by painshill]
http://www.portal.state.pa.us/portal..._period/407008
[compiled by painshill]