Final answer:
The excerpts from Muriel Rukeyser's 'Poem' that establish parallel structure are the infinitive phrases 'To construct ... to make ... to reconcile' and the repetition of 'as the lights'.
Step-by-step explanation:
The words that establish a parallel structure in the excerpt from Muriel Rukeyser's 'Poem' are 'To construct ... to make ... to reconcile'. These infinitive phrases are used in a series to create a rhythm and a pattern of similarity in the actions they describe, which contributes to the poem's overall structure. Additionally, the repetition of 'as the lights' at the beginning of the lines contributes to the parallelism by setting a mirrored framework for the imagery of the darkness and the brightening night.