Answer:
of us- adverb phrase
of the pioneer- adjective phrase
Step-by-step explanation:
An adjective phrase working as a prepositional phrase provides more information about the noun or pronoun in the sentence. In the phrase, 'of the pioneers who traveled West,' the prepositions qualify the noun, 'pioneers'. A description of what the pioneers did is also provided- they traveled.
The phrase, 'few of us', is an adverb phrase as we are given the information- how much of something. Adverbs provide answers to why, when, where, and how much of a particular thing.