The Trend to Concentrate on Problems at Home

Around 2007-2008, we see a lot more support across the board of concentrating on problems here at home as opposed to being active in world affairs when Pew Research frames it that way. And that sort of sticks through 2014-2015, but then you get to 2019 and there's a narrowing again where Americans are more supportive of being involved in global affairs. So what's happening there? Because it does seem like maybe there was an fallout from the Iraq war? Was it a fallout from the bad economy?