Any time a political system has to induct a formerly excluded group into the political process, there is apt to be some uncertainty about what the consequences will be. This has been true in the United States on several occasions. When the Nineteenth Amendment was under discussion, there was considerable interest in what effect the feminine vote would have. When Southern blacks began to vote in large numbers in the 1960s, politicians and scholars wondered what the consequences would be. In 1971, with the ratification of the Twenty-Sixth Amendment, the impact of the youth vote is being debated, even though we have twenty years of sophisticated behavioral research to guide our speculation.

In the United States, the political process is basically stable and institutionalized. But many countries are not so fortunate, particularly those that are moving rapidly from a traditional to a modern style.