As far as I know, some wiki pages related to Chinese news in Chinese language have been monitored by content contributors in China mainland, and they have banned IP addresses from North America to edit some items. You can try editing this URL link and will see their notice:
https://zh.wikipedia.org/wiki/%E5%9B%BD%E8%88%AA%E7%9B%91%E7%AE%A1%E5%91%98%E7%89%9B%E5%AE%87%E8%99%B9%E8%AF%AC%E9%99%B7%E4%B9%98%E5%AE%A2%E4%BA%8B%E4%BB%B6