There is a long line of people starting in the Arctic circle and ending at the equator.

Along this line, everyone pretty much looks like his neighbours in terms of skin pigmentation.

But, at the Arctic circle end, the people are very pale, and at the equatorial end, the people are very dark.

There are no discontinuities on this line, everyone just pretty much blends into their neighbours, appearance-wise.

Then one day some groups from the northern end of the big line, decide to go live in a colony together. And for (bad) reasons, some people from the southern end of the line are bought there also.

Now, we have, people who at home blend into their neighbors - but because we're in a colonial setting away from home, it's easy to see who came from the north of the line and who came from the south.

WHITES ARE OPPRESSORS

People from the north of the line had a lot of geographical advantages. They could do a four-crop rotation, which was not possible further south than France for climate reasons, and so feed a far larger population. They had access to massive oak forests to build boats to sail the world. They had the right climactic moisture levels to process cotton and flax in amounts massive enough to trigger an Industrial Revolution. So, the north of the line, people ended up in an advantageous position because of geography.

NONWHITES ARE VICTIMS

When they moved to their colonies, they utilised the fact that some groups were recognisably not from the north of the line, to build an exclusionary society. You already know how people with darker pigmentation were banned from living in White Australia. Or how people with darker pigmentation had to use different restaurants or water fountains or banks or sports leagues in America and couldn't get a mortgage or store to rent, and were legally discriminated against, I know this is not new information to anyone.

BUT RACE DOESN'T EXIST

it certainly doesn't. Notice how all along the big line of people, everyone blends imperceptibly into their neighbors. It's only when you take a group from one end of the line, and a group from the other end of the line, and compare them, can you create the idea of race. Ethniticies do exist. Race does not. There is no scientific marker or genome that can be pointed to as proof of race. But ethniticies do exist with markers that can be scientifically established.

YET I LOVE RACIAL DIVERSITY

Race doesn't exist but ethnic diversity is fantastic and preferred by nature, because it encourages the diversification of disease resistance and antibodies. The most successful, innovative and healthy societies have always been multiethnic.

AND I CELEBRATE OUR DIFFERENCES BECAUSE WE'RE ALL THE SAME

Two animals can only have fertile offspring when the two animals are the same species. And all humans are the same species, yet, with different disease resistances and antibodies and cultural history and so on, which are valuable to nature and society.

So there, OP, I know some people are mentally deficient and were never taught this stuff at school, so I thought I would help you be explaining this to you. Now you know.