I would assume the answer would be limited or restricted.
Ethnicity is like your culture. Language, race, and religion all play into your background and culture. However, politics are something that govern the country you live in -- they're not necessarily connected to your background. Therefore, politics would be the correct answer.
I’m 90% sure the main idea of Truman’s statement is that they should never be used in war because of the unnecessary total destruction of virtues and killing of 100,000’s of innocent civilians
