Please check your sentences on your NF quiz. I got the wrong answer for the last question for the event in which I thoroughly read it and the last question to have 25 correct answers.
From your question "What is the Newest nation to be added to the game?"
from my understanding it's asking what nation will be added in the future from the phrase "to be added" that's why I picked the answer "None of the above" since those listed nations are already added in the game.
Maybe you should change the question to "What is the Newest nation that has been added to the game" for others to easily understand the question. If that would be the question I should have answered "Regia Marina".
Please correct me if I'm wrong