80% of Americans have never visited a Holocaust museum. But clearly the reasoning is real: 58% believe that something like the Holocaust could happen again, with almost as many (52%) saying it could happen in the United States today.

There is a broad-based consensus among Americans that schools must be responsible for providing comprehensive Holocaust education, according to the survey.

It found that there were significant age gaps in knowledge about the Holocaust, with 22 percent of millennials saying they haven't heard or were not sure if they have heard of the Holocaust, compared to 11 percent for all USA adults.

A third of the world's Jews were murdered in the Holocaust.

A two-minute siren sounded in Israel on Thursday for Holocaust Remembrance Day, which commemorates the roughly six million Jews murdered by the Nazi regime during World War II.

Nearly half of millennials polled - 49 percent - and 45 percent of all US adults were unable to identify one of over 40,000 concentration camps or ghettos in Europe used by the Nazi regime.

More than 220,000 Holocaust survivors now live in Israel, according to the Israeli Finance Ministry. It also found that most Americans desire an overall improvement in the quality of the Holocaust curriculum.

Just over two thirds (68%) thought that anti-Semitism was present in the United States, half believed there were many neo-Nazis in the country, and most people thought it was important to continue teaching about the Holocaust and that it should be compulsory in schools.

"This study underscores the importance of Holocaust education in our schools", said Greg Schneider, Executive Vice President of the Claims Conference.

The survey, which was commissioned by the Conference on Jewish Material Claims Against Germany (also known as the Claims Conference), found that many Americans were unaware of basic facts about the Holocaust. "There remain troubling gaps in Holocaust awareness while survivors are still with us; imagine when there are no longer survivors here to tell their stories".

The survey was conducted by Schoen Consulting between February 23-27 with a randomly selected demographically representative sample of 1,350 Americans.

"We must ensure that the history of the Holocaust remains forever relevant and that no people suffer these tragedies ever again", the proclamation says. Respondents were selected at random and constituted a demographically representative sample of the adult population in the United States.