Why are some people expats and others immigrants? Can the only difference be the colour of their skin?

In the lexicon of human migration there are still hierarchical words, created with the purpose of putting white people above everyone else. One of those remnants is the word “expat”. What is an expat? And who is an expat? According to Wikipedia, “an expatriate (often shortened to expat) is a person temporarily or permanently residing in a country ot…