Why might welles have chosen to change the verbs in the radio broadcast to present tense

If the radio broadcast was happening currently and was speaking about current events, the verbs would need to be in present tense since the actions would be taking place in the present.

because of all the immigration, america became one big melting pot. the diversity of cultures from all over the world made america somewhat divided as well. people that immigrated stayed with their kind, and their traditions, while native born americans stayed with their kind and their traditions. normally, people born in american scorned the immigrants as well. the new religions also divided america. in summary, it took away from the american culture and identified america as the "melting pot."