What you describe is part of, but not the entire reason why tensions arise around migration. There are at least two main drivers for tension which are missing, very broadly defined those related to cultures and social security systems where the latter is often related to the former. Taking the recent revelations about fraud in Minnesota as an example - which encompass both mentioned factors - it becomes clear that the tension is not so much about the fact that about 80.000 people from Somalia moved to this region but that these people:
(culture) by and large did not integrate into local Minnesotan culture but remain focused on their Somalian culture and traditions including clan culture which now has a marked influence on the local political climate with people voting along clan lines
(social security) for a large part are and remain dependent on the social security systems: 81% of Somali immigrants are dependent on some of the welfare systems, 78% of those who have lived for more than 10 years in the area remain dependent on these systems [1]
Combine this with the practice of calling out any criticism of these facts as 'racist' and tensions quickly arise.
(culture) by and large did not integrate into local Minnesotan culture but remain focused on their Somalian culture and traditions including clan culture which now has a marked influence on the local political climate with people voting along clan lines
(social security) for a large part are and remain dependent on the social security systems: 81% of Somali immigrants are dependent on some of the welfare systems, 78% of those who have lived for more than 10 years in the area remain dependent on these systems [1]
Combine this with the practice of calling out any criticism of these facts as 'racist' and tensions quickly arise.
[1] https://cis.org/Report/Somali-Immigrants-Minnesota