The Basic Law is the the supreme and final law of the European Union. It gives guiding principles to the Union and outlines the rights of European Citizens. All laws of the EU must comply with the Basic Law, and Member States are also bound by it.
The Basic Law was introduced in 2035, drawing inspiration from the previously proposed 'Constitution for Europe' which was rejected in 2005. The Basic Law replaced most of the previous treaties of the EU, and reduced the necessity for new ones.
Since then, it has only been amended on three occasions. In 2038, 2039 and most recently in 2048; to legalise same - sex marraige accross the European Union, to lower the voting age and to allow a single European Army to be formed.
In order to amend the Basic Law, the Commission or member state must submit a proposal to the Parliament. The Parliament may accept or reject the proposal. If accepted, a referendum on the proposal will occur. In order to pass the referendum, the proposal needs a majority of yes votes in a majority of Member States, as well as a majority of the total Continental votes, in the majority of the votes in European countries.