Conversation so far:
who visited all the countries in the world
Graham David Hughes was the first person to visit all 193 United Nations member states and several other territories across the world without flying.
Is Graham David Hughes the youngest person to visit all countries?
On May 31, 2019, a 21-year-old named Lexie Alford stepped foot in North Korea, becoming the youngest person to travel to every country on earth.
Was Lexie Alford the fastest to reach every country?
Taylor Demonbreun currently holds the Guinness World Records for the the fastest time to visit all sovereign countries.

Question: What is the newest member to join the total list of countries?
Self-contained rewrite: What country is the newest member state to the United Nations?