Yakko Warner's Countries of the World (1993) is way more based than I remembered.

Did that dude just say Dahomey

One "country" he does mention? Taiwan.

I guess you could argue that they're not all countries because Guam, Greenland, San Juan (should be Puerto Rico), Abu Dhabi and Transylvania aren't countries either.

I found a YouTube link in your post. Here are links to the same video on alternative frontends that protect your privacy:

• yewtu.be
• inv.nadeko.net
• yt.artemislena.eu
• piped.video

I memorized this as a kid and still use it to remember countries for like trivia games and such