Under the Old Locust Tree

The five hundred years of "rooting" of the Zhang family were not about heroes saving the world, but countless people silently picking up hoes, burying the dead under the locust tree on the roadside, and then continuing to walk until they entered the village named after "Zhang". The child in the village has heard since he was a child that his roots are under the old locust tree in Shanxi, but how did his ancestors get here? The adults couldn't tell, and the old people had never seen the old locust tree.