parts of it in his inaugural encyclical Summi Pontificatus, which he titled "On the Unity of Human Society". His various positions on church and policy issues during his tenure as Cardinal Secretary of State were made public by the Holy See in 1939. Most noteworthy among the 50 speeches is his review of Church-State issues in Budapest in 1938. Reichskonkordat and Mit brennender Sorge The Reichskonkordat was an integral part of four concordats Pacelli concluded on behalf of the Vatican with German States. The state concordats were necessary because the German federalist Weimar constitution gave the German states authority in the area of education and culture and thus diminished the authority of the churches in these areas; this diminution of church authority was a primary concern of the Vatican. As Bavarian Nuncio, Pacelli negotiated successfully with the Bavarian authorities in 1925. He expected the concordat with Catholic Bavaria to be the model for the rest of Germany. Prussia showed interest in negotiations only after the Bavarian concordat. However, Pacelli obtained less favorable conditions for the church in the Prussian concordat of 1929, which excluded educational issues. A concordat with the German state of Baden was completed by Pacelli in 1932, after he had moved to Rome. There he also negotiated a concordat with Austria in 1933. A total of 16 concordats and treaties with European states had been concluded in the ten-year period 1922–1932. The Reichskonkordat, signed on 20 July 1933, between Germany and the Holy See, while thus a part of an overall Vatican policy, was controversial from its beginning. It remains the most important of Pacelli's concordats. It is debated, not because of its content, which is still valid today, but because of its timing. A national concordat with Germany was one of Pacelli's main objectives as secretary of state, because he had hoped to strengthen the legal position of the church. Pacelli, who knew German conditions well, emphasized in particular protection for Catholic associations (§31), freedom for education and Catholic schools, and freedom for publications. As nuncio during the 1920s, he had made unsuccessful attempts to obtain German agreement for such a treaty, and between 1930 and 1933 he attempted to initiate negotiations with representatives of successive German governments, but the opposition of Protestant and Socialist parties, the instability of national governments and the care of the individual states to guard their autonomy thwarted this aim. In