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However, in its one-person-one-vote decision in Reynolds v. Simms (1964), the Supreme Court argued that everyone’s vote should count roughly the same regardless of where they lived.

Reynolds v. Simms , 379 U.S. 870 (1964).
Districts had to be adjusted so they would have roughly equal populations. Several states therefore had to make dramatic changes to their electoral maps during the next two redistricting cycles (1970–1972 and 1980–1982). Map designers, no longer certain how to protect individual party members, changed tactics to try and create safe seat     s so members of their party could be assured of winning by a comfortable margin. The basic rule of thumb was that designers sought to draw districts in which their preferred party had a 55 percent or better chance of winning a given district, regardless of which candidate the party nominated.

Of course, many early efforts at post- Reynolds gerrymandering were crude since map designers had no good way of knowing exactly where partisans lived. At best, designers might have a rough idea of voting patterns between precincts, but they lacked the ability to know voting patterns in individual blocks or neighborhoods. They also had to contend with the inherent mobility of the U.S. population, which meant the most carefully drawn maps could be obsolete just a few years later. Designers were often forced to use crude proxies for party, such as race or the socio-economic status of a neighborhood ( [link] ). Some maps were so crude they were ruled unconstitutionally discriminatory by the courts.

A series of three maps titled “Gerrymandering in Austin, TX, 2003-2015”. The map on the left is labeled “2003-2005” and shows four districts outlined around a city labeled “Austin”. The map in the center is labeled “2005-2007” and shows five districts outlined around a city labeled “Austin”. The map on the right is labeled “2013-2015” and shows six districts outlined around a city labeled “Austin”.
Examples of gerrymandering in Texas, where the Republican-controlled legislature redrew House districts to reduce the number of Democratic seats by combining voters in Austin with those near the border, several hundred miles away. Today, Austin is represented by six different congressional representatives.

Proponents of the gerrymandering thesis point out that the decline in the number of moderate voters began during this period of increased redistricting. But it wasn’t until later, they argue, that the real effects could be seen. A second advance in redistricting, via computer-aided map making, truly transformed gerrymandering into a science. Refined computing technology, the ability to collect data about potential voters, and the use of advanced algorithms have given map makers a good deal of certainty about where to place district boundaries to best predetermine the outcomes. These factors also provided better predictions about future population shifts, making the effects of gerrymandering more stable over time. Proponents argue that this increased efficiency in map drawing has led to the disappearance of moderates in Congress.

According to political scientist Nolan McCarty , there is little evidence to support the redistricting hypothesis alone. First, he argues, the Senate has become polarized just as the House of Representatives has, but people vote for Senators on a statewide basis. There are no gerrymandered voting districts in elections for senators. Research showing that more partisan candidates first win election to the House before then running successfully for the Senate, however, helps us understand how the Senate can also become partisan.

Sean Theriault. 2013. The Gingrich Senators: The Roots of Partisan Warfare in Congress . New York: Oxford University Press.
Furthermore, states like Wyoming and Vermont, which have only one Representative and thus elect House members on a statewide basis as well, have consistently elected people at the far ends of the ideological spectrum.
Nolan McCarty, “Hate Our Polarized Politics? Why You Can’t Blame Gerrymandering,” The Washington Post , 26 October 2012.
Redistricting did contribute to polarization in the House of Representatives, but it took place largely in districts that had undergone significant change.
Jamie L. Carson et al., “Redistricting and Party Polarization in the U.S. House of Representatives,” American Politics Research 35, no. 6 (2007): 878–904.

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Source:  OpenStax, American government. OpenStax CNX. Dec 05, 2016 Download for free at http://cnx.org/content/col11995/1.15
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