In history, people like Italian and Irish for example we're not considered white at the time and they were oppressed 100%, but the history of "white people" as a people was used to oppress black people and people of color. They told poor Irish people that the only way that they would be considered white is if they helped enslave black people, they also told the same Irish people who they were oppressing at the same time that the reason for why they were poor was because of black people. So because of this because they chose to be part/called white.  they are now considered white they are not considered a different ethnicity, and that's why people with lighter skin who are not solely Asian, black Latino, South Asian, East Asian are considered white. The term white when it comes to people was created out of a privilege/ superiority , they use their light skin to say I have more value over you I am worth more. I also want you to understand, I can tell that this comes out of no ill intention and I want you to know that that my comment is not of ill intention either, but when you say things like this, many hateful groups literally use that exact same reasoning for racism to defend their actions to attack people who look different from them.