What are some controversial amendments?

Answer 1

Do you mean amendments that have actually been ratified, amendments that have been proposed, or possible amendments? You also did not mention amendments to what. I will answer regarding amendments to the US constitution. The sixteenth amendment (income tax) would defiantly qualify as controversial. The eighteenth amendment (Prohibition) was so controversial that it was the only amendment to be repealed (by the twenty-first amendment). The 'Equal Rights Amendment is/was controversial. There has been talk, it not a formal proposal of both 'Flag Burning' and 'Marriage Protection" amendments. I personally would like to see an amendment requiring Congress to repeal a law every time they passed a new one.

Answer 2

The Second Amendment is, in my opinion, far the most controversial. It guarantees that the citizens can possess guns, but this amendment was adopted before the United States had any credible military (which it now does, of course), and a simple farmer with his musket was considered a useful component of the common defense. (Now that's a long time ago!!!!) Also, very importantly, this amendment was created before the historical arrival of the social sciences of criminology and sociology, which have much research showing that guns make all of society more violent and lethal, actually less safe. (Without this research, we could not know that firearms, conceptually, do not make SOCIETY safer; it just makes people who are fearful FEEL safer.)