White supremacists carried medieval signs in Charlottesville because the miedeval signs are used by people in France and Britain to represent a time of racial purity in their country that never existed and never will exist. In general, white supremacists just want to make up fantasies of a time that never existed with the miedeval signs.
The end of the 19 century, American Imperialism kept growing up, they wanted more land, more resources, but they couldn't deal with the Great Powers in Europe, so they invasion Spain.
Because Adolf Hitler, an antisemite, wanted to rid Jews of Germany. He blamed the Jewish people for Germany's problems and before they were sent to labor camps/death camps, they were cramped into ghettos. The Warsaw ghetto is just one of the many.
