>>13118415The concept of race appeared when people started exploring the worlds in boats
If you walk from say Holland to Korea, passing through Istanbul, you would notice people's features gradually changing.
But if you got on a boat in Holland and then arrived in Korea you would be all like wtf these people look totally different.
This being said, human evolution includes superstructures: tribes, nations, civilizations. These superstructures interplay with biology to change fitting attributes and preferences of females in a demarcated way: in x civilisation a certain characteristic may be valued while in y it is shunned. So there are some relatively clear demarcations. An example is that English people are less prone to certain types of violence, as a result of sentencing to death all violent convicts for centuries. So even though they are also capable of cruelty and war etc, you have less people in English "stock" who will break into your house and smash your skull to steal your car keys. That doesn't mean that there are none, or that all members of any other "race" are likely to do so, only that a random English man is less likely to do so than a random person of some other "races."
Another factor is cross breeding.
Not only did human populations gradually isolate and evolve divergently, but they then moved around and remixed. For instance west europeans are a blend of 3 or 4 original "races, slavs are a blend of europeans and mongols, etc. Most homo sapiens are a blend of homosapiens and neanderthal and denisovan, a much older mix, tens of thousands of years ago, compared to the european mix, about 6 thousand years ago, and the slavic mix, less than 2000 years ago.
There is an exception to the gradient. Some populations have 2-19 percent mix of another ancestral cousin, neither neanderthal nor denisovan, and other populations have none of this.
