Why do some people or nations view migrants as a threat, while others view than as a boom

Although the term economic migrant may be confused with the term refugee, economic migrants leave their regions primarily due to harsh economic conditions, rather than fear of persecution on the basis of race, religion, nationality, political opinion, or membership of a particular social group.

Explanation:

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letter a is the answer

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what started the norman conquest?

profound political, administrative, and social changes in the british isles. last line of my information: )