The largest factor in support for Donald Trump's proposed border wall is political affiliation: support is much higher among Republicans than among Democrats. But is there a geographic component to that support? For example, is a Republican in Laredo, Texas, more (or less) likely to support the wall than a Republican in Peoria, Illinois?

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Job approval for Trump is by far the biggest factor, even moreso than party affiliation. The New York Times recently did an article about this, based on polls from many sources. While looking just at the map may seem like there is a geographic component (fewer living near the border support the wall in most cases)...


... the next chart shows that even over time, support follows Trump's approval ratings quite well.


So it seems that geography is probably at best a side effect of the issue (or vice versa, depending on how you view US politics and the urban/rural divide). As they put it in the article:

There is tentative evidence in the Fox data that the wall is particularly unpopular in the relatively white and rural West, but somewhat more popular, at least with respect to the president’s approval rating, in the Northeast and inland South. This would follow a familiar pattern in American politics: It mirrors the president’s support in the presidential primary and tracks with longstanding measures of racial resentment.

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    It would be more interesting to look at the map, if it was adjusted by the percentage of Republican voters in each state. As is, this is simply a map of where Republicans are popular. Commented Jan 16, 2019 at 19:22
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    I agree, but I couldn't find better numbers than this, and don't have the time to draw my own map. However, with the close way the poll numbers track each other over time, I suspect you could get close to a good map (with a couple outlier states) by finding a state-based Trump approval rating poll.
    – Geobits
    Commented Jan 16, 2019 at 19:43

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