Question: What year did the region where Leuna was located come to an end?

Knowledge 1: German Revolution of 1918–19
In Leipzig, Hamburg, Bremen, Chemnitz, and Gotha, the Workers' and Soldiers' Councils took the city administrations under their control. In addition, in Brunswick, Düsseldorf, Mülheim/Ruhr, and Zwickau, all civil servants loyal to the emperor were arrested. In Hamburg and Bremen, "Red Guards" were formed that were to protect the revolution. The councils deposed the management of the Leuna works, a giant chemical factory near Merseburg. The new councils were often appointed spontaneously and arbitrarily and had no management experience whatsoever. But a majority of councils came to arrangements with the old administrations and saw to it that law and order were quickly restored. For example, Max Weber was part of the workers' council of Heidelberg, and was pleasantly surprised that most members were moderate German liberals. The councils took over the distribution of food, the police force, and the accommodation and provisions of the front-line soldiers that were gradually returning home. [SEP] Knowledge 2: Merseburg
From 1657 to 1738 Merseburg was the residence of the Dukes of Saxe-Merseburg, after which it fell to the Electorate of Saxony. In 1815 following the Napoleonic Wars, the town became part of the Prussian Province of Saxony.
Knowledge 1: German Revolution of 1918–19
In Leipzig, Hamburg, Bremen, Chemnitz, and Gotha, the Workers' and Soldiers' Councils took the city administrations under their control. In addition, in Brunswick, Düsseldorf, Mülheim/Ruhr, and Zwickau, all civil servants loyal to the emperor were arrested. In Hamburg and Bremen, "Red Guards" were formed that were to protect the revolution. The councils deposed the management of the Leuna works, a giant chemical factory near Merseburg. The new councils were often appointed spontaneously and arbitrarily and had no management experience whatsoever. But a majority of councils came to arrangements with the old administrations and saw to it that law and order were quickly restored. For example, Max Weber was part of the workers' council of Heidelberg, and was pleasantly surprised that most members were moderate German liberals. The councils took over the distribution of food, the police force, and the accommodation and provisions of the front-line soldiers that were gradually returning home. [SEP] Knowledge 2: List of That '70s Show characters
In the final episode, Eric returns to Point Place for the New Year and he and Donna kiss. It is presumed that they end up together again at the end of the series and the end of the 1970s.
Knowledge 1: German Revolution of 1918–19
In Leipzig, Hamburg, Bremen, Chemnitz, and Gotha, the Workers' and Soldiers' Councils took the city administrations under their control. In addition, in Brunswick, Düsseldorf, Mülheim/Ruhr, and Zwickau, all civil servants loyal to the emperor were arrested. In Hamburg and Bremen, "Red Guards" were formed that were to protect the revolution. The councils deposed the management of the Leuna works, a giant chemical factory near Merseburg. The new councils were often appointed spontaneously and arbitrarily and had no management experience whatsoever. But a majority of councils came to arrangements with the old administrations and saw to it that law and order were quickly restored. For example, Max Weber was part of the workers' council of Heidelberg, and was pleasantly surprised that most members were moderate German liberals. The councils took over the distribution of food, the police force, and the accommodation and provisions of the front-line soldiers that were gradually returning home. [SEP] Knowledge 2: Friedensdorf
Friedensdorf is a village and a former municipality in the Saalekreis district, Saxony-Anhalt, Germany. Since 31 December 2009, it is part of the town Leuna.

Answer: 1738