* Austria: The birthplace of Adolf Hitler and a country that was annexed by Germany in 1938.
* Poland: The country where the largest number of Jews were killed in the Holocaust, including the Auschwitz concentration camp.
* Hungary: A country that was allied with Germany during World War II and participated in the Holocaust by deporting Jews to concentration camps.
* Romania: A country that was allied with Germany during World War II and participated in the Holocaust by deporting Jews to concentration camps.
* Bulgaria: A country that was allied with Germany during World War II, but refused to deport its Jewish population.
* Denmark: A country that was occupied by Germany during World War II, but managed to save most of its Jewish population by evacuating them to Sweden.
* United States: A country that entered World War II in 1941 and played a major role in defeating Germany. The US liberated several concentration camps and helped to bring Nazi leaders to justice.