HOW THE STATE IS ORGANISED: THE SPANISH CONSTITUTION

The Constitution is the most important law in Spain.
It was approved by the Spanish people in 1978.
In a referendum.
A referendum is when all citizens vote on an important subject.
The Constitution recognises the rights and obligations of the Spanish people.
The Constitution also establishes the national institutions: the Lower House of Parliament, the Upper House of Parliament and the Courts of Justice.

First page of the Spanish Constitution, from Wikipedia.

Spanish Referendum in 1978

Lower House of Parliament in Spain.

Upper House of Parliament in Spain.

Constitutional Court of Justice in Spain.