This question is hard to answer for two reasons.
"White people" has no defined meaning. At different points in modern history it's included or excluded diffrerent cultures, and can even very between person. It has no consistent scientific, popular, or anthropoligical definition. Furthermore, it's a racial category that didn't exist as far back as you're asking about, and we can't exactly determine skin color from skeletal remains.
"Civilization" has no defined meaning. Whenever it's used academically, it's intentionally vague. I say "Maya civilization" because there's no unifiyng political entity to refer to, and "city-states" is too political. I'd exchange it with culture, society, or people. A Classical Civ major at my school will take classes in history, culture, art and language- a distinctly broad approach to Classics that a Classical Languages major won't get. In the past, the term was a terribly loaded word to describe an "adavnced" culture with certain requirements like citiea and writing. That idea hasn't been accepted for a long time.
I think it's quite rude that your post was downvoted to nothing. Hopefully I can provide some insight into your question.
edit: /u/CommodoreCoCo also wrote a great response to your question
Several things:
1. Race is a human construct. It has changed vastly over time in various ways and locations.
For example, the idea of white has changed drastically over the last 100 years in America. In 1900, the only people in America seen as white were Anglo-Saxons. Irish, Italians, Greeks, and many Southern/Eastern European peoples weren't considered white during the industrial revolution. Our idea of white has slowly evolved to mean not black. It's only very recently (historically speaking) that the concept of white was extended to mean continental-European ancestry.
But Iranians and other Persian cultures are directly descended from Indo-Europeans. They even till this day speak languages that are related to our own European languages. Would you consider Iranians white?
2. With that in mind, what do you view as the differences between races?
Skin color? Skull structure? it may seem like semantics, but these questions are vital. Would you consider the Greeks white people? How about Italians? They're certainly darker than my pasty-white ass, but does that make them not white? Southern Europe has historically been a very diverse place due to it's proximity to the incredible cultural diversity of the Mediterranean's trade network that resulted in much genetic exchanging... in other words, do you believe people can "lose" racial ancestry?
It's things like these that make the concept of race a very dubious one. This is just a small part of why considering race a biological construct into a historical narrative is useless.
I hope this helps.
Probably the Greeks.