Least divisive of the last 5 Presidential elections?

[SingingAnalyst]

I would argue 2004. The nation was still somewhat unified after the 9/11 attacks, neither Kerry nor Bush made major inroads into groups they had not already done well with in 2000, and not much was different from 2000.

Compared to 2000, Bush improved marginally among Blacks (11% vs. 8%) and Jews (22% vs. 16%). Kerry did pick up most of Nader's support, but that was perhaps the only counterargument, the famous "United States of Canada" and "Jesusland" map notwithstanding.

[SingingAnalyst]

It seems to me most of the loathing of Bush on the Left came after Katrina.

I don't doubt 2004 was divisive, but it broke little new ground, electorally (except in pockets where Nader had gotten a large share of the 2000 vote, like Cambridge, MA and Austin, TX).

2000 on the other hand saw the first clear red/blue county/state demarcation; 2008 saw growing GOP strongholds like AR-TN-KY-WV swing even more GOP; 2012 continued that trend (I'd say 2012 was the 2nd least divisive); and 2016 speaks for itself.

I'd say 2004 - 2012 - 2000 - 2008 - 2016.