A common feature of sixth-party era American politics that makes it difficult to hold parties accountable for their performance in office is divided government.
Divided governments were uncommon in the early 19th century, but since the 1970s they have appeared more frequently. The approach can be compared to the parliamentary system's integration of the executive and legislative branches of government.
According to the Princeton Encyclopedia of American Political History, Reagan's election and the election of a Republican Senate in 1980 marked the beginning of the Sixth Party system. Whether electoral reform during the 1960s is referred to as "realignment" or not, the "sixth party system" formed between 1964 and 1972, according to Arthur Paulson.
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