In theory and over-simplified this would be true, in practice I think the way the electoral college has failed when 4+ candidates get into a tight election has lead to a lot of safeguards being created: The US political parties as institutions became more hostile to third parties and both the states and feds adopted laws more favorable to a two party system.
Canada, & UK for instance don’t quite adhere to duverger’s law as strongly and in fact most non-US countries that still have fptp elections seem to have more diverse party systems.
In theory and over-simplified this would be true, in practice I think the way the electoral college has failed when 4+ candidates get into a tight election has lead to a lot of safeguards being created: The US political parties as institutions became more hostile to third parties and both the states and feds adopted laws more favorable to a two party system.
Canada, & UK for instance don’t quite adhere to duverger’s law as strongly and in fact most non-US countries that still have fptp elections seem to have more diverse party systems.