If you were to create a museum for one ethnic group/country, what would you display [20th century]?

Create a Museum of ____ History covering the twentieth century.
You get five rooms - how will you organize this museum and what will you put in it?
for each room, explain your choice of theme and details
It can focus on history and memory of one or more of the major historical traumas of twentieth-century Europe. World War I, World War II, the Holocaust, or Communism

I think I'd go with Jews as they have a long history?
What other ethnic groups/countries would you pick?
Just some fodder for me to research.

Question

If you were to create a museum for one ethnic group/country, what would you display [20th century]?

Create a Museum of ____ History covering the twentieth century. 
You get five rooms - how will you organize this museum and what will you put in it? 
for each room, explain your choice of theme and details 
It can focus on history and memory of one or more of the major historical traumas of twentieth-century Europe. World War I, World War II, the Holocaust, or Communism

I think I'd go with Jews as they have a long history? 
What other ethnic groups/countries would you pick?
Just some fodder for me to research.