An obstacle which was faced by the union pacific railroad workers but not the central pacific workers is: B. conflict with American Indians.
Who are union pacific railroad workers?
The union pacific railroad workers can be defined as a group of young Civil War veterans and Irish immigrants that were saddled with the responsibility of providing railroad related services to commuters.
Unlike the central pacific workers, an obstacle which was directly faced and experienced by the union pacific railroad workers is conflict with American Indians (Native Americans) because the American Indians wanted to reclaim the jobs and way of life that was being taken away from them.
Read more on American Indians here: https://brainly.com/question/549336
