Then what limited the growth of forager peoples so substantially? There had to be a mechanism to prevent them from exceeding their region's carrying capacity. If a tribe of 50 people grew at a rate of 1% a year for 2000 years there would 24 billion people in it. Clearly that didn't happen; in fact there have been massive die-offs from starvation due to cyclical climate change, or to resource warfare (sometimes fought to extinction) between neighboring tribes.
As to resource warfare, it's a non-starter for most foragers. You walk away, or you strike an agreement about the use of lands. There are conflicts anyway, but they're infrequent -- the incentive isn't present to justify a bloody battle most of the time. And it doesn't come up as often as you think, either, because as I've stated, forager populations don't grow as quickly (they tend to stay around carrying capacity when different groups are summed over a given area) and indeed, devote active effort to keeping it that way, which supplements the tremendous p...
From Mike Darwn's Chronopause, an essay titled "Would You Like Another Plate of This?", discussing people's attitudes to life:
Conclusion, graphs, and references in article. As usual, I recommend reading Chronopause.com as Darwin has many good articles; to quickly link a few: