The phrase "a constitution on" is correct and usable in written English.
It can be used when referring to a constitution that pertains to a specific subject or issue.
Example: "The committee is drafting a constitution on environmental protection to ensure sustainable practices."
Alternatives: "a constitution regarding" or "a constitution pertaining to".
The Agent for Foreign Affairs, Van der Goes who had been in favor of distancing the Republic from the French, chose this inopportune moment to secretly approach the King of Prussia as a mediator, with a scheme in which the Hereditary Prince was to become a kind of constitutional monarch in a constitution on the model of the American Constitution.
His preference was for an Italian republic with a constitution on the French model.
Westminster and Whitehall won't suddenly embrace a constitution on democratic grounds.
A successful revolution at Palermo on January 12 , 1848 and subsequent agitation among Neapolitan liberals forced Ferdinand to grant a constitution on January 29.
Postwar Japan accepted the demand to create and ratify a constitution on the American pattern with legislative and judicial branches and elected officials.
The king yielded and granted a constitution on modern lines with a parliament and elections.In the event, it turned out that Thailand had replaced absolute monarchy with domination by the army.
On May 8, the West German parliamentary council adopted a constitution, and on May 23 the Federal Republic of Germany came into being.
The government had been hoping to solidify its standing by holding a referendum on a new constitution on June 27, but the ethnic violence has thrown those plans into doubt.
They drew up a constitution based on self-determination for all of Ethiopia's many ethnic groups.
Such practices violate Islamic law, and would presumably also be banned by a constitution based on international standards.
It's a constitution focused on the use of power, especially military power, and it's being written in blood.
