Observations on the history of oil painting

Who have been the major players throughout the history of oil painting? Why is this so?
Major players are Edward Hopper, Vincent Van Gogh, Henri Matisse, etc.
Who seems to be missing from the history of oil painting? Why is this so?
Women, and non whites are missing from the history of oil painting.
Where in the world did most oil painting taking place?
Most oil painting took place in Europe and the United States.
Where did all these oil paintings go? Why? How does where these paintings “live” affect who learns about them and why?
Oil paintings are found in art gallery's, museums, and in people's homes. Where these paintings live affect who learns about them because they might be in more wealthy or educated environments.
How has subject matter changed over time? Why?
The subject matter has changed over time because it has gone from a more nature-like activity to something that mostly the educated people know about.