Talk Elections

Usually when the partisan control of a state is shifting, the current party trifecta becomes a divided government. A few years later that divided government becomes a trifecta of the opposite party. There have been several notable election waves such as 1994, 2006, 2010, and 2018. Many states partisan control has shifted quickly due to these waves. But only two states have flipped directly from a Democratic Trifecta to a Republican Trifecta without a period of a divided government in between. These full trifecta flips occurred during the 2010 elections in Wisconsin and Maine. How exactly does this happen? Is it simply a very strong wave or a variety of factors that just happened to fall perfectly in place?

I have done a lot of research on the partisan control of all of the states and discovered that these are the only full trifecta flips in recent politics. While information about partisan control of states prior to 1992 is out there, it is not as accessible as the more recent elections. Are there any more trifecta flips that have occurred in any other elections prior to 1992?