The American attitude shifted in favor of rights for Native Americans. This is based on "Polls showed that Americans believed in rights for Native Americans". Why it's not B is because it wasn't the polling that contributed to the act, but what the polls showed which is C.
One is early the other is other is old
Answer:
It caused them to lose their natural resources, mainly lands.
Explanation:
Following the settling of Europeans in the American lands. Over a certain period, the European settlers started having trades with the native Americans. Within a short time, there exists a well-trafficked American Indian trade network.
However, this well-trafficked trades between the two groups led to Europeans demanding more resources and landed properties.
This was evident between Pilgrims and the Native American people around the 1620s. Where trades led to a series of disagreements and eventually to King Phillip's war between the two groups. The native was conquered eventually and lost their landed properties.