U.S. Presidential and Congressional gerrymander election data for 1920-1996 is at http://clerkweb.house.gov/histrecs/history/elections/elections.htm The gerrymander data for the U.S. House of Representatives was severe before 1964-1966 when the U.S. Supreme Court required one person- one vote in districts within a State (thus raising minority rule percentages in most states to around 30 percent- just over half the votes in just over half the districts). Since there was a blatantly unconstitutional failure to reapportion seats after the 1920 Census, the 1922-1930 data is doubly severe (which helped set the stage for the 1929-1941 Great Depression). Election method folk may wish to estimate the effects of using p.r. for elections.
