Answer:
The Haida's location on the Queen Charlotte Islands well off the west coast of British Columbia in Canada helped to keep them safe from attacks by other tribes because of the difficulty of crossing the Hecate Strait to the mainland.
Explanation:
A nonessential clause is essentially an aside or provider of superfluous information about a preceding word that might be interesting but is insignificant to the sentence's main point.
The city that we visited on vacation was my father’s home town.
Was my father’s home town is an adjective clause.
Essential clauses modify keywords and are important to the main point of a sentence. Nonessential clauses provide superfluous information that, while interesting, does not change the main point of a sentence.
Learn more about adjective clauses here
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