 After the founding of the Reich in 1871 and the subsequent legal unification but the constitutional construct Kürnbach appeared more abstruse and the privileges of the “tax haven” were hardly to be represented against the other citizen.Despite the Kürnbacher's resistance, a state treaty between the two states was concluded on May 11, 1903 in Heidelberg.Kürnbach thus belonged to the Grand Duchy of Baden from 1 January 1905.