Deutsch divided security communities into two types: the amalgamated and pluralistic ones. Amalgamated security communities are quite rare in history. They are created when two or more previously independent states form a common government. An example is the United States after the original thirteen colonies ceded much of their governing powers to the federal government. Amalgamation is not always successful and can be overturned, as the failed Union between Sweden and Norway exemplifies. An alternative and less ambitious process is called integration. Integration leads to a pluralistic security community, in which states retain their sovereignty. The United States with Canada is an example of a pluralistic security community. Both countries are politically independent, but they do not expect to have future military confrontations, in spite of having had some in the past. Deutsch argued that the pluralistic security communities are easier to establish and maintain than their amalgamated counterparts.