Direct experience, but it's not hard to find public supporting evidence, either. https://www.economist.com/christmas-specials/2017/12/19/the-opium-wars-still-s

Direct experience, but it's not hard to find public supporting evidence, either. https://www.economist.com/christmas-specials/2017/12/19/the-opium-wars-still-shape-chinas-view-of-the-west https://www.economist.com/christmas-specials/2017/12/19/the-...