No Expansion Required
200 galaxies. Random starting positions. Random velocities in all directions. Only physics: gravity and momentum-conserving mergers. No expansion of space. No dark energy. No Big Bang initial conditions.
As galaxies on collision courses merge, the surviving population consists increasingly of galaxies moving apart. The farther ones have been moving apart longest — so they are furthest away. This produces v proportional to d — the Hubble Law — as a statistical outcome of sorting.