What is the main difference between old and new regionalism?

Scholars of regionalism tend to distinguish between 'old' and 'new' regionalism, referring to the two phases of this phenomenon. With the term 'old regionalism', we refer to the attempts at regionalisation and region building occured mainly in Europe from the aftermath of the Second World War to the end of the Cold War. This first phase of the phenomenon was deeply driven by the fear of new escalating tensions in Europe and the rise of the two super powers - US and USRR. With the end of the Cold War, instead, a new phase began and numerous regional international organisations were created. This time, what brought countries together was more the pression of globalisation and global economy than security issues.