The plaintiff's lawyer calls witnesses to the stand, where they take the oath.
Politics also must balance security with individual liberty because many possible and actual safety measures involve restrictions on liberty.
When you live in a place that is ethnically diverse you get more restaurants with great food, better grocery stores, etc. It could lead to exposure to other cultures, which can lead to interest in things that you normally wouldn't encounter. Diversity can lead to more opportunities.
Happy studying ^-^