Context: Later, the constitution was amended to state that the citizens of the 16 states had successfully achieved the unity of Germany in free self-determination and that the Basic Law thus applied to the entire German people. Article 23, which had allowed "any other parts of Germany" to join, was rephrased. It had been used in 1957 to reintegrate the Saar Protectorate as the Saarland into the Federal Republic, and this was used as a model for German reunification in 1990. The amended article now defines the participation of the Federal Council and the 16 German states in matters concerning the European Union.

Question: What was the German constitution later amended to say about the citizens of the 16 states?
Answer: had successfully achieved the unity of Germany

Question: Article 23, before it was rephrased allowed what?
Answer: "any other parts of Germany" to join

Question: Which state was Article 23 used to reintegrate? 
Answer: Saar Protectorate

Question: The amended article 23 now defines the participation of the Federal Council and what else?
Answer: the 16 German states

Question: What was amended to signify that Basic Law no longer applied to the German people?
Answer: Unanswerable

Question: How was article 23 rephrased to reintegrate the Saar Protectorate?
Answer: Unanswerable

Question: What was used as a model for German Reunification in 1980?
Answer: Unanswerable

Question: Which article does the Federal Council define?
Answer: Unanswerable

Question: How many states are a part of the German Union?
Answer: Unanswerable