What were native american groups most threatened by?

buffalo herds
other native american groups
drought
diseases introduced by white settlers

the viking voyages took place during the middle ages, which was about this time. 500 to 1350. the viking voyages took place during the middle ages, which was about this time.

informed opinion on immigration policy and immigration reforms from the american pubic is not complicated but a nuance. most americans support secure borders and they are not happy that the national’s immigration system is broken. people think that immigrants that shoulder similar responsibilities like native americans should be able to become americans. in the recent polls, stats have shown that there is a good support for tenets of comprehensive immigration reform. for example, in recent polls concerning opinions on immigration reforms, voters want congress to act even if status quo has no support. immigration opponents suggest that latino and non-latino voters disagree and there is controversy in the issue of citizenship.the truth is that the issue is about its leadership and problem-solving aspect and not about immigration reform.the opponents of immigration reforms advocate for the promotion of two myths where the first one is that republican politicians have a choose on latino votes and the second one is that the path to citizenship for unrecorded immigrant is controversial among all this !