How was Gondor founded?

[Galadriel55]

Originally Posted by eothain of fenland

Tolkien, however (as far as I know) doesnt't mention any strife between these two peoples.

As far as I know, there wasn't much strife. When Isildur&co first came, there weren't too many Numenorian pioneers - only five ships arrived at Anduin, if I remember correctly (the other four being with Elendil at the gulf of Lhun). As big as Numenorian vessels can be, I doubt that there were enough people to really pose a threat of taking over too much land. Gondor is large, there's room for everybody... until those Dunedain start multiplying and annexing more and more land...