Immigrant is a different concept from Native. Native is related to Indigenous. Indigenous is the opposite of Foreign. Foreign is related to Import. 
Proclaim is a synonym of Acknowledge. Acknowledge is a synonym of Concede. Concede is a synonym of Confess. 
Immigrant <--DistinctFrom--> Native <--RelatedTo--> Indigenous <--Antonym--> Foreign <--RelatedTo--> Import 
Proclaim <--Synonym--> Acknowledge <--Synonym--> Concede <--Synonym--> Confess 