Electoral and Party Systems

Electoral laws are often regarded as the key factors structuring party competition. Yet, despite having very similar electoral systems, reflecting a shared colonial legacy, the United States (U.S.) and Canada have had very different party systems. For the past 100 years, the U.S. is perhaps the most consistently two-party system among the world’s major democracies, but during this same period Canada has experienced considerable variation in the number of parties represented in Parliament at the national level. This chapter addresses both the causes and consequences of this puzzling divergence in party systems in the two countries. We also compare a number of other features of the two nation’s electoral institutions, including campaign finance rules, rules for constituency boundary drawing, bicameralism, and the mechanism for the selection of the executive, with particular attention to the U.S. Electoral College and its alleged link with two-partyism. We also examine the policy consequences of the divergence in party systems and look at the way in which party competition in the two countries may affect voter turnout.