Answer:
The interactions between early settlers and Native Americans created tension because they were competing groups for limited resources.
While it is true that these groups often colaborated with each other, for example, the pilgrims and the sorrounding tribes, more often than not, they engaged in conflict.
The settlers ended up having the upper hand not only due to superior technology, but also due to superior numbers, because most of the Native American population died out due to Eurasian diseases for which they did not have immunity.