National is etymologically related to Nation. National is related to Liberty. Liberty is a synonym of Autonomy. 
Mainstream is a synonym of Common. Common is related to See. See is related to Notice. Notice is a synonym of Knowledge. 
Nation <--EtymologicallyRelatedTo-- National <--RelatedTo--> Liberty <--Synonym--> Autonomy 
Mainstream <--Synonym--> Common <--RelatedTo--> See <--RelatedTo--> Notice <--Synonym--> Knowledge 