I thought that building the henge was itself a sign that the warring between the tribes was stopping?
Research finds Stonehenge was monument marking unification of BritainProfessor Mike Parker Pearson, of Sheffield University, said: 'When Stonehenge was built there was a growing island-wide culture - the same styles of houses, pottery and other material forms were used from Orkney to the south coast.
'This was very different to the regionalism of previous centuries.' The building of the monument also underlined the new spirit of co-operation, he added.
'Stonehenge itself was a massive undertaking, requiring the labour of thousands to move stones from as far away as west Wales, shaping them and erecting them,' he went on.
'Just the work itself, requiring everyone literally to pull together, would have been an act of unification.'