April 12th is Holocaust Memorial Day, but it's celebration starts at sunset on April 11th.
The survey, conducted by Shoen Consulting on behalf of The Conference on Jewish Material Claims Against Germany (Claims Conference) found that 11 percent of USA adults and 22 percent of millennials "haven't heard" or "are not sure if they have heard of the Holocaust".
The occasion marks 75 years since the Warsaw Ghetto uprising and will feature Game of Thrones actress Laura Pradelska, who has been recalling the stories of each of her four grandparents, who all survived the Holocaust.
The Auschwitz-Birkenau complex, which lies in southern Poland, was the biggest death camp set up by Nazi Germans during World War II to eliminate European Jews.
While 6 million Jews are estimated killed in the Holocaust, 31 percent of all respondents and 41 percent of millennials, aged 18 to 34, believe that number is 2 million or less, according to the survey. The U.S. Holocaust Memorial Museum says that at least 1.3 million people were deported to the camp, run by Nazi Germany in occupied Poland, from 1940 to 1945, and 1.1 million of them were killed. The Strahl in there might sound unusual, and that's because it's actually a surname - one that belonged to his wife's grandparents, who were both Holocaust survivors. Forty-one percent of Americans, and 66 percent of millennials, can not say what Auschwitz was.
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"We must ensure that the history of the Holocaust remains forever relevant and that no people suffer these tragedies ever again", the proclamation says.
Asked to identify what Auschwitz is, 41 percent of American adults as a whole and 66 percent of millennials could not come up with a correct response identifying it as a concentration camp or extermination camp.
Greg Schneider, executive vice president of the Claims Conference, said, "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".
Claims Conference President Julius Berman said it is "vital to open a dialogue on the state of Holocaust awareness so that the lessons learned inform the next generation". Respondents were selected at random and constituted a demographically representative sample of the adult population in the United States.