I decided to embrace today's Geneabloggers prompt to the fullest - and cover two topics.
Did some of your Connecticut ancestors disappear around 1800? You may want to start looking in Ohio. Connecticut held onto a portion of its territory after the American Revolution. When Connecticut started to become "overcrowded," families move west for new land. Settlers first stopped in New York, but when that filled, they continued on to Ohio.
That land was surveyed and ready for them well before they arrived. To turn the land into funds the state needed, the state had sold the land to speculators. They subdivided it into townships and sold off the pieces. This preparation meant that settlers built new lives in towns that were already organized - and quickly came to look like their homes in Connecticut.
For more information, visit the following sites.
What does this mean for you as a genealogist, besides that you may want to start looking for vital records in Ohio? It might be worth checking out the Connecticut State Library's Western Reserve papers. Most of their records relate to the sale of lands to specific land companies, but take a look anyway. You may find what you need. Visit http://www.cslib.org/westernreserve.htm.