Unification should not be included on a quiz about countries' independence. Also San Marino got independence from the Roman Empire not Italy, and Switzerland got their independence from the Holy Roman Empire. Countries gaining independence from themselves makes very little sense, and isn't even accurate Iran did not gain independence from Persia since they're the same country at most they've just had a change in regime/government type same with Mexico and Japan.
Edit: Uruguay gained independence from Brazil not "Spanish"
Edit: Uruguay gained independence from Brazil not "Spanish"