In the 20th century, internationalisation took off enormously following World War II. Whereas internationalisation is actually only concerned with products or services, globalisation focuses less on those aspects but much more on a process of global economic, political, and cultural integration between countries and continents. Internationalisation is also encouraged from an institutional perspective. The only way of attaining true unification is by having member states relinquish their national economic and political sovereignty to one or more communal institutions the result is an economic union. Within the US, the governments of the member states collaborate in terms of international legislation, security, human rights, global economic development, and the study of social and cultural development. Many theories have been developed as to why organisations or countries take part in internationalisation. Looking at the different phases of internationalisation, studies have also shown that, in terms of physical and cultural distance, organisations also shift their boundaries outwards.