Answer:
Prejudice
Explanation:
Prejudice is a negative preconception of of an individual that often leads to unfavourable attitude towards such individual. Prejudice may arise from a baseless stereotyped beliefs about an individual's gender, social class, age, beliefs, values, religion, sexuality, race/ethnicity, language, political affiliation, nationality, beauty, occupation, education or other personal characteristics that can influence (especially negatively) how a person behaves towards such individual.
From this question, the white student has prejudiced opinion about the concert based on the ethnic background of the Chinese students
This is of course a very complex question that does not have a definitive answer, but 1850s would be a good decade to start counting as "Modern". This was a decade of the telegraph and Darwin's The Origin of Species.
<span />
Different religious beliefs
Answer:
I think Civil Wars.
There are many wars in Africa because of poorness and ungrateful and weak government systen