Photos show how much grocery shopping has changed since the first supermarkets opened a century ago

• Grocery shopping has changed dramatically over the last century. • Supermarkets first started emerging in the 1920s, forever altering how people shop for food. • Photos show the shift from small stores to supermarkets in the US.

For most Americans who don't use Instacart, grocery shopping today probably doesn't look all that different from their childhoods — they may mourn the discontinued Dino Pebbles cereal or be grateful for the option to self-checkout, but the fundamentals aren't all that different.

Go back over 100 years, though, and many familiar features wouldn't be found. Many US city-dwellers relied on markets, peddlers, and small shops to get most of their goods. If they did pop into a grocery store, a clerk would wait on them, selecting each item from a shelf or back roo