The timespan between the original Reichskonkordat and this letter was six years. It appeared the Nazi regime did not respect the Vatican, and it became apparent

The timespan between the original Reichskonkordat and this letter was six years. It appeared the Nazi regime did not respect the Vatican, and it became apparent soon that their agreement wasn't going to be upheld as expected by the Nazis. In addition, the differences between Nazism and contemporary fascism (which the Church was mostly supportive of) became more apparent over time and drew some criticism as well.