The increases the authority of the institutions of the european union and is designed to accommodate the changes brought about by the monetary union and the admission of new members.

Amsterdam Treaty

Explanation:

The Amsterdam Treaty was signed on 2 October 1997 according to which the Member States decided to engage in broad policy and institutional changes. The Treaty authorized member states to increase certain powers from national governments to the European Parliament, covering diverse issues like legislating on foreign and security policy, adopting civil and criminal laws and immigration laws. It paved the way for implementing institutional changes to accommodate its expansion because of the new member nations joining the EU.