The era when all four forces may have operated as one is called the Planck era.
The Planck era had a small life duration. It is the time prior to the big- bang.
Scientists believe that the time duration between the big-bang and the Planck era was only 10^-43 seconds.
The four forces that now control our universe are the gravitational, the nuclear strong, the nuclear weak, and the electromagnetic forces.
During the Planck stage, all four forces acted as one. Since the universe was tiny during this time, quantum gravitational forces controlled the universe.
However, there is no available theory or mathematical model that can describe how all nature's forces were once combined.
To learn more about the Planck era, you can check this:
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