Racial beliefs constitute myths about the diversity in the human species and about the abilities and behavior of people homogenized into "racial" categories.
I believe abilities and behavior are more categorized towards ethnicity than race. Ethnicity is religion, culture and practices which alternatively is a better explanation for human abilities and behavior.
The different physical traits of African-Americans and Indians became markers or symbols of their status differences
This is in fact true because white were considered the "better race" because of their light skin tones, blonde hair and blue eyes. They were most similar in appearance to gods/goddesses.
Historical research has shown that the idea of "race" has always carried more meanings than mere physical differences;
I believe the idea of "race" is purely just physical appearance and nothing more. For example, if an individual was a red head we would automatically classify her as "white" since it's nearly impossible for asians, hispanics and blacks to develop red hair.
Throughout history whenever different groups have come into contact, they have interbred. The continued sharing of genetic materials has maintained all of humankind as a single species.
I agree, due to technological advancement humans can now travel to different countries. Therefore, Interbreeding is not a shocking fact also countries are becoming more diverse and accepting.