This article uses the case of health insurance policy in the United St
ates and Canada, to try to explain how particular state-societal patte
rns of intermediation unfold, become institutionalized and effect quit
e different policy strategies. It begins by outlining the importance o
f formal political and administrative institutional structure in the e
xercise of autonomous state action. It then examines the concepts of p
olicy community and policy network as state-specific vehicles of inter
est intermediation and finally, it grounds the theoretical discussion
in a comparative description of the evolution of health policy in the
United Stares and Canada. It concludes that to a great extent, we are
the prisoners of our institutions-both political and societal-and with
out fundamental change, necessitating major upheaval, the United State
s is unlikely to embrace a national health insurance program similar t
o other western nations.