Dresden is grossly overstated. 35k. Maybe. The large numbers came about from Nazi propaganda during the war, then Soviet propaganda during the cold war. Real Germans records support the lower numbers, Goebels literally added a zero to the real figure civil defense gave him and published it as an allied attrocity. I'll give you the Soviet rapes, etc. They had no problem murdering their own in countless tens of millions, a few hundreds of thousands or even millions of Germans would be small change to the CCCP killing machine.
Regardless, there is a huge difference between bombing--even area bombing--a city that is actively involved in war, and rounding up people
who have already capitulated and (take your pick of industrial murder techniques and place here) them.
How many cities did we burn to the ground AFTER they had surrendered? None. How many people who surrendered themselves to German "relocation" were relocated to a trench covered with lime, or smoke in the air? A lot more than "none." A lot more than all the allied bombing deaths (legitimate or not)
combined.
We'd know about American Concentration Camps? Where? The best you'll get are the Japanese Americans rounded up wrongly. They lost time, and property, they weren't murdered. None of them.
http://www.hawaii.edu/powerkills/20TH.HTM
(US in ww2 is in there, BTW, he credits us with ~700k democides from bombing (mostly Japan---which might be in error since technically most japanese were combatants by Imperial Edict (all men 15-65, all women 17-47)).
tater