They did. Natives didn't have agriculture:
> It definitely did. Also note that agriculture was invented in multiple places over time. Unfortunately, the Native Americans did not invent it quickly enough, so they had far less time for technological development before Europeans arrived. At which point, it was too late.
The unfortunate thing is that those dumb Natives didn't learn to grow things. Something that had been observed for thousands of years.
Edit: We're talking ~10k years difference.