Our ancestors were on the move but not all of the time. There were periods, often long periods, when family groupings lived and multiplied in specific geographical areas. They stayed in these places long enough that certain traceable genetic mutations occured in their DNA. The result is that it is possible to trace family groups when they made their big moves.
This graphic shows (in black) the" R" Y-DNA immigration. This is relatively recent. The graphic, however, shows the migration from the single male proginator "Adam" from Africa. (There were others, but their DNA didn't make it.) The R1b sub-group made it into Europe. You can see that our (Manley) sub-group (sub-clade) is R1b1a2a1a1b3c1. This pretty much locates us in England with other family members who have very similar deep clades.