Well for starters the colonists were trying to take over the Native Americans' land and countries, which was made more conflicted by the fact that most Native Americans' ideas about land and countries were very different than the colonists'. The colonists also wanted the Native Americans to change religions and become Christian, which the Native Americans thought was rather silly and were perfectly happy with their own beliefs. The colonists also had a tendency to not care at all about the health or lives of the Natives, largely because the Natives were brown, and not Christian, and so the colonists were perfectly fine with simply killing Natives who got in the way of their plans, something which didn't go over too well with the Natives at all, and when the Natives fought back, the colonists promptly killed most of them, which they were able to do because they had guns, and the Natives, for the most part, didn't.
The root cause of the conflicts between the Native Americans and the colonists that shaped the modern world in America was simply because of the beliefs of the opposing parties. Native Americans valued nature greatly, while colonists want to settle with industry built in it, and that caused a fight that eventually ended the civilization of the Native Americans due to their lack of modern weaponry.
china has been maintaining policies that kept their economy very inefficient and poor. but when the forign trade came up. china was among the fastest growing economies and later they helped millions of pple out of poverty.
