You should have combined the flags of Spain and Mexico, just like you did with the UK and USA. Mexico has the largest number of Spanish-speaking inhabitants in the world.
As a Greek I love France, I even went to Paris and I would like to learn French, but unfortunately French is a bit difficult, so I would like to learn Spanish.
Korean is the national language of North Korea, so this video shows the most learned languages on Duolingo by countries. There is no data in North Korea because the public cannot access the internet.
