Let's not ignore the fact that Sam Walton had enough cash to buy a department store at the age of 27. That helps too.
No small sum I suppose. (around $300k adjusted for inflation). But also not a "small million dollar loan". ($4 million inflation adjusted even IF it were true.)
But Sam's real story is not the rags to riches. It the brilliant and hard work that took him from riches to extraordinary success.
Additionally, when his father died, all that money was passed down. Had that amount of money been put in the S&P 500 at the time, trump would be far richer today.
So poor people should never try to be an entrepreneur because the world is rigged against them? Well that surely will help reduce the wealth inequality.