Because the average temperature in the room also increased.
When we feel excitement, our blood will regulate faster and create faster metabolism. This will lead to higher body temperature because of the nutrient burning process. If this happen to all people in the arena, the average temperature is bound to be increased.<span />
The company towns reinforced it by having special wages for people of different ethnicity or by racially profiling and segregating those that they didn't want to be equal with Caucasian workers. This caused an even bigger drift between people and distrust to arise.
The time period that it was in
