September 17, 1787
Constitution Day and Citizenship Day was first declared on September 17th by Congress in 1952. This day is observed to honor the signing of the United States Constitution in 1787 and to recognize the rights and responsibilities of U.S. citizens.
Citizenship Day, also known as Constitution Day, is celebrated to honor and recognize the adoption of the United States Constitution. It highlights the importance of citizenship and encourages Americans to reflect on the rights and responsibilities that come with being a citizen. It is an opportunity to educate and engage citizens in the principles and values of the Constitution.
By law, the US doesn't recognize dual citizenship (i.e. constitution prevents dual nationality) but somehow it always does recognize it.
Constitution day and/or independence day
The state of California will recognize the probate. It is part of the Constitution of the US that they must do so.
Look in the constitution, it says it there
Constitution Day in Spain is on December 6.
Constitution Day in Thailand is on December 10.
Constitution Day in Romania is on December 8.
Constitution Day in Uzbekistan is on December 8.
Constitution Day in Italy is on January 1.
It is written into the US Constitution. States have to recognize the actions of other state.