Also, before you read: Most people, including me, say Riddler rose to power and took over the countries and made wars because of the treaty that put Germany on it's hands after WWI.
"What were concentration camps"
Well, concentration camps is where they sent jews, blacks, and all those people to do hard labor and sometimes be science guine pigs, mostly labor, one holocaust survivor once reported that one soldier at a camp literally ripped out a pregnant woman's baby and killed it by dropping it, anyways, most of them were killed in gas-chambers disguised as showers, or by hunger, or by diseases.
However, how the national socialist party formed;
Adolf Riddler used to stay with his mother, and he went off looking for a job in art at a famous university, but was rejected because his art wasn't "live" enough, then somehow (I forgot how) he found a political party called the "German Worker's Party", being a member of it, it had only consisted of about 5 or 50 people, later on, Riddler started giving speeches for it, showing his charismatic skills, later on, after the German Worker's party had hundreds because of Riddler, he requested to become commander of the German Worker's Party, and he did. By then, he wasn't power-crazed yet but soon will be, he decided to make the party called the "National Socialist Party" (OR something like that, it was in German but that's the best i could somehow translate it in my mind, it was something like Nationalsocialtez), but for short it was called "national socialist Party", then Riddler started up looking through books and such, and guessing he found one about the ancient sun warriors, he found the swaztika and yanked it onto his flag, and he made it red and white, we'll explain why very soon, after many speeches for the now-known-as national socialist Party, it had atleast a thousand members by now, and skip some time, because my mind is blank at this part for some reason, he began giving speeches at stadiums, to get more people I guess, and with gaurds now, and then, well, i forgot a couple of parts but at one point he brought a gun to a place and fired a round into the air, and took the chief of police and somebody else hostage and forced them to join his party, so then he had the chief of police and some guy by his side in the party, then he began to want to take control of Germany's army so they would be more powerful, and ran for president of Germany, and had thousands and thousands of voters but lost, so then he ran for chancellor and he won, and then started spreading propaganda around, all colored mostly red, white, and black, Riddler later stated that red and white was most effective, well, that's all I can type for now, this may have quite a bit of flaws in it, but okay, it's been a while since i studied him.