In this paper the decline of party voting in the U.S. House of Representatives from 1887 to 1968 is analyzed. The levels of party voting (by Congress) are fitted to a regression line, with the results showing a high period of party voting (1890-1910), an intermediate period (1911-1940), and a low period (1941-1968). A model is developed to measure the effects on party voting of external variables-party homogeneity, party conflict, presidential partisanship, and turnover; and internal variables-centralized leadership and caucus strength. Both types of variables are shown to have some effect, but external-and particularly electoral-variables are more important. Since these variables are culled from contemporary research, the results demonstrate that contemporary hypotheses and findings regarding legislative parties are generalizable over time.
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