Verified Answer :

WorldlyGlass49

Another term for peacefulness or calmness is definitely tranquility. 
The other words have nothing to do with the feeling of peacefulness of calmness, rather with politics.

xsandmagic

Answer:

The correct option is DOMESTIC TRANQUILITY.

Explanation:

DOMESTIC TRANQUILITY refers to PEACE AMONG THE STATES. Hence, if we talk about peacefulness or calmness on the streets we are referring to domestic tranquility. The Federal government has the power (given by Constitution) to squash rebellion and to smooth any tension among the states.  

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