Plenty of US states have small populations, no? Also lots of states are comparatively homogeneous (Sweden has 19% of population as recent immigrants).
Georgia, Michigan, NC and NJ are the closest in size but that's about where it ends. Michigan probably has the closest demographic homogeneity. However the existence of the federal government as well as natural resources as a economic base throws a wrench into any further comparisons.
True for Norway, but not any other country in the neighborhood (fine, Scotland I guess)