Not "Pilgrims later". It should be "Later Pilgrims". Meaning ones that came later in time, and often from different places with different interests. Americans are/were never from the same place, nor are they of the same mind or actions. Learn American history. Not all tribes and pilgrims were hostile to each other. In fact, many got along. However common viruses for which natives had no defense, did most of the killing. Yes fighting occurred, but this is the history of man, such as it is even in the middle east in 2012.
EU's Mogherini in Tehran to talk nuclear deal, regional issues (Reuters)
from the article: Thanksgiving: A truly American holiday for Jews and Gentiles alike