Question: The Dachau Trials and the division of Germany happened due to what?

<P0-S0> Dachau concentration camp (German: "Konzentrationslager (KZ) Dachau" , ] ) was the first of the Nazi concentration camps opened in Germany, intended to hold political prisoners. <P0-S1>  It is located on the grounds of an abandoned munitions factory northeast of the medieval town of Dachau, about 16 km northwest of Munich in the state of Bavaria, in southern Germany. <P0-S2>  Opened in 1933 by Heinrich Himmler, its purpose was enlarged to include forced labor, and eventually, the imprisonment of Jews, German and Austrian criminals, and eventually foreign nationals from countries that Germany occupied or invaded. <P0-S3>  The Dachau camp system grew to include nearly 100 sub-camps, which were mostly work camps or "Arbeitskommandos ", and were located throughout southern Germany and Austria. <P0-S4>  The camps were liberated by U.S. forces on 1 May 1945. <SEP> <P1-S0>  The trials, which were held within the walls of the former Dachau concentration camp, were conducted entirely by American military personnel whose legal authority had been conferred by the Judge Advocate General's Department within the U.S. Third Army. <P1-S1> The Dachau trials were held for all war criminals caught in the United States zones in occupied Germany and Austria, as well as for those individuals accused of committing war crimes against American citizens and its military personnel. <SEP> <P2-S0> The Busan Subway fire refers to the fire that happened on July 16, 2014 in Busan, South Korea. <P2-S1>  The fire happened at the City Hall Station at 5:41 p.m. during which 5 people were injured and 400 more were evacuated. <P2-S2>  According to the Korean police, the fire happened due to faulty wiring which linked air conditioner to the external power supply. <P2-S3>  The Metro began operating again as normal by 6:55 p.m. <SEP> <P3-S0> Upon the defeat of Nazi Germany in World War II, the victorious Allied powers asserted their joint authority and sovereignty over 'Germany as a whole', defined as all territories of the former German Reich which lay west of the Oder–Neisse line; having declared the extinction of Nazi Germany at the death of Adolf Hitler (see 1945 Berlin Declaration). <P3-S1>  This division was ratified at the Potsdam Conference (17 July to 2 August 1945). <P3-S2>  In autumn 1944 the United States, United Kingdom and Soviet Union had agreed on the zones by the London Protocol. <P3-S3>  The powers at Potsdam approved the detachment from 'Germany as a whole' of the German eastern territories east of the Oder-Neisse line; with the exact line of the boundary to be determined at a final German Peace Treaty. <P3-S4>  This treaty was expected to confirm the "shifting westward" of Poland's borders (back to approximately as they were before 1722), as the United Kingdom and the United States committed themselves to support there the permanent incorporation of former eastern German territories into Poland and the Soviet Union. <P3-S5>  In the closing weeks of fighting in Europe, United States forces had pushed beyond the agreed boundaries for the future zones of occupation, in some places by as much as 200 mi . <P3-S6>  The so-called line of contact between Soviet and American forces at the end of hostilities, mostly lying eastward of the July 1945-established inner German border was temporary. <P3-S7>  After two months in which they had held areas that had been assigned to the Soviet zone, U.S. forces withdrew in the first days of July 1945. <P3-S8>  The four powers divided 'Germany as a whole' into four occupation zones for administrative purposes, creating what became collectively known as Allied-occupied Germany (German: "Alliierten-besetztes Deutschland" ). <P3-S9>  Some have concluded that this was a crucial move that persuaded the Soviet Union to allow American, British and French forces into their designated sectors in Berlin, which occurred at roughly the same time (July 1945), although the need for intelligence gathering (see Operation Paperclip) may also have been a factor.