Answer:
Cultural differences
Step-by-step explanation:
Cultural differences has to do with the various beliefs, practices behaviors, and languages which is usually distinct and considered unique to members of a particular race, ethnicity or nation.
Such various differences can lead to problems resulting to cultural clashes, segregation, tribalism, etc.
The problem Claude and Robert were facing is as a result of cultural differences. The Americans were still finding it difficult to fully carry the two Europeans along due their differences.