How does “We, the successors of a country and a time, Where a skinny Black girl,
Descended from slaves and raised by a single mother,
Can dream of becoming president,
Only to find herself reciting for one.”
show there's always positivity even in dark times.

from the political point of view it could be said that the candidate   is an effective speaker because she takes a strong position on the issue. it is an open discussion but probably she is making a presentation and can choose which subjects she wants to address. she is very likely to attain her aim which is to convince voters to accept her proposal.

yes? ? what is your question lol cos this isnt

i think it is a conjuction because it is definitly not a preposition