Only missed 3. And they were only in the last few, which were, in my opinion, more opinion questions.
For instance: Free markets typically secure more economic prosperity than governments centralized planning because:
I destroyed the history type questions.
For me as well. I definitely agree that some of the questions toward the end were based on opinion rather than fact. I did struggle with a few of the less widely known history questions but ended up narrowing them down. Fun quiz.