Disney+ launched in 2019 and now reaches 60+ countries, but the catalogue varies dramatically by region. The US library has the deepest Marvel, Star Wars, and Pixar collections plus the merged Hulu library and the Star general entertainment hub in non-US markets. Australia and Canada get most of the US catalogue. Latin America gets Star+. Several countries — including most of Africa, Russia, and South Asia — get nothing at all.
A VPN lets you access whichever Disney+ region has the title you're looking for. Marvel's What If…? was on US Disney+ months before some markets. National Geographic specials roll out in waves. Star Wars: The Mandalorian had earlier UK access than several EU countries.