And all the people are white.
American liberals look to the Scandinavian/Nordic countries as an example of a viable socialist system. And it is- the cradle-to-grave Scandinavian welfare system does work. But it is only viable in a homogenous society where the people share the same values of hard work, thrift and respect for the law. To a large extent, the success of the Scandinavian countries is based on culture, not the socialist system they have adopted.
Witness the problems places like Denmark and Sweden have had in integrating non-Western immigrants who do not share the same cultural values.