Ustaše-led puppet state covering most of Croatia and Bosnia-Herzegovina, established after the April 1941 Axis invasion of Yugoslavia; a protectorate of Fascist Italy until 1943, then of Nazi Germany, notorious for genocide against Serbs, Jews, and Roma.
Collapsed with the Axis defeat in May 1945; territory absorbed into the new Socialist Federal Republic of Yugoslavia.
The atlas holds 2 border frames for Independent State of Croatia (NDH) — the shape you scrub through changes in 1941 · 1943.
The definitive scholarly history of wartime occupied Yugoslavia, with extensive dedicated coverage of the Independent State of Croatia's establishment, ideology, and collapse.