We now have ample evidence that public policies diffuse across the American states; that is, policy adoption is due at least in part to the emulation of policies enacted in nearby states. But, policy adoption is the result of a complex process, a process that often takes years and sometimes decades to complete. According to the "stage" or "step" approach, the lawmaking process begins with the identification of a public problem for which redress by governments is sought and ends when programmes are implemented and effects are evaluated. Using the tertiary education system in the USA as a case, this study considers at what stage(s) in the policymaking process pressures created from neighbouring states are brought to bear. Analysis of data from state policymakers reveals that the experiences of neighbours are most pronounced during the agenda-setting and proposal formulation stages and least during adoption. (Contains 2 tables, 1 figure and 4 notes.)