Final answer:
The relationship between Robert and Thomas in the movie Glory is difficult due to their different backgrounds and conflicting perspectives.
Step-by-step explanation:
The relationship between Robert and Thomas in the movie Glory is especially difficult because they come from different backgrounds and have conflicting perspectives. Robert, played by actor Matthew Broderick, is an educated white officer and Thomas, played by actor Andre Braugher, is a black soldier who has faced discrimination and prejudice. Their relationship is strained due to societal norms and the racial tensions of the time.