In August 2009, the Democratic Party of Japan (DPJ) won a crushing victory over the Liberal Democratic Party (LDP), thus bringing to an end over fifty years of one-party dominance. Around the world, the victory of the DPJ was seen as a radical break with Japan's past. However, this dramatic political shift was not as sudden as it appeared, but rather the culmination of a series of changes first set in motion in the early 1990s.

The Evolution of Japan's Party System analyses the transition by examining both party politics and public policy. Arguing that these political...