Time's Tapestry

Time's Tapestry is a four-volume alternate history and science fiction series by British author Stephen Baxter. The four novels are Emperor, Conqueror, Navigator, and Weaver.

The narrative begins in 4 BCE and ends in 1943 (in a different timeline than our own).

In short, the science-fiction premise of this alternate-history epic is that our timeline today, i.e., history as we know it, is the result of a series of interventions from an alternate future into its past, the last of which occurs as the story ends, resulting in our own timeline.