I can't see why French Guiana wouldn't be a part of Latin America... I mean, French comes from latin, same as Portuguese and Spanish.
Latin America, to me, always seemed to be "America, minus US and Canada".
I mean, all the other countries have Portuguese, French or Spanish as official language... even when it isn't the case. Looks like in Paraguay most people speak some sort of advanced Tupi.
Haruki-kun, Dusk Eclipse, greetings from Brazil!
Because I suck at geography and the French Guaina was the first country I recognized in the map Rawhide linked.