Why were the concentration camps be concentrated mostly in Germany?

Answer 1

They were really not concentrated in Germany.
Ten of the twenty-three major concentration camps created by the Axis in
World War Two were located in Poland, nine were in Germany and four
were located in other countries. Answer 2 The Camps in Germany were built to hold Germans who spoke out of turn, and were reported to the Gestapo, sometimes by their own families, even their children. They were terrible places to be in, but not true death camps, at first anyway. Dachau, for example, was a so called, re-training camp, but many Germans died anyway, and others, had their spirits broken, and returned to their families, altered people. However, very soon, people died from beatings, starvation, or just because they gave up. And then they were a smaller version of the true death camps. Many became testing grounds for killing people, and if it worked, then it was used in the big death camps in Poland. There were in fact hundreds of camps in Germany. Some very small, others for special projects. Even being built near Factories to supply a free works force. Some of the well known names around today, and supplying things like washing machines, cars, and Iron smelters, were involved in this. One about today, built the Crematoriums used in the camps in Poland and other places.