2004-2008. A relatively stable time with things in stasis. The most dramatic thing that happened was Hurricane Katrina and Bush becoming unpopular, but unless you lived in New Orleans your life wasn't affected.
Wow I totally disagree with this. We had two presidential elections, the first very close and the latter extremely historic, during that time. The Iraq War turned into a quagmire; Saddam Hussein was executed. The freaking iPhone was invented, as was Facebook. Those two things changed the world massively. There was a global recession, the worst since the Great Depression. This was a majorly important time in recent history for the US and the world.
I think the period between like 2011 and 2015 (when Trump launched his campaign) was more stable and boring. The 2012 election wasn’t all that close or unpredictable or exciting, though the Republican primaries were amusing. The Arab Spring happened but ultimately failed, essentially, so it didn’t really matter as much as initially expected. Bin Laden was killed, but that happened early in this time. Hell I’m even happy to put it as between that point and when Trump launched his campaign in June 2015; that was a relatively boring and stable four year period.