The belief that native born americans are superior to foreigners is called

The belief that native born Americans are superior to foreigners is called nativism.
It is a theory that if you are born somewhere and are a long-term citizen of a particular country, you are deemed as more worthy than foreigners and immigrants, which is obviously not true. This idea is frowned upon in contemporary society as it can be seen as anti-immigrant position. 

B. it promoted the powers of the executive branch