As I start to use TMG to generate reports for research papers, I find I am using history tags much more often. This, in order to maintain an historical perspective to those reports. For example, a History Tag noting the creation of West Virginia during the civil war, in order to sort out people actually born in West Virginia from those born in a part of Virginia that is now (post civil war) part of West Virginia (usually such people born before June 1853 are reported as having been born in West Virginia, even though it didn't yet exist). I haven't been using Timelines, but I have found History Tags noting such things as when a state became a state, changes to county boundaries, and other historic events useful.
I am wondering how others are using History Tags, and was hoping for some additional ideas.