In Austin Texas we have an absurdly well marked crosswalk on the way to the elementary school, to a close approximation nobody has ever stopped to let us cross. Our daughter was nearly killed once, so far. It seems so many people in America are so fat now they don’t imagine people would ever walk, so they drive without regard for pedestrians and active hostility towards cyclists and park in the way of sidewalks, maki…
In most places in America walking is not a practical mode of transportation because of distance; it’s miles from your house to the grocery store, for instance. If you live in a city this might not be obvious to you but half the country lives in the burbs or rural areas.
Separately, it would be nice if we had more sidewalks, but they are financially unsustainable in low density areas.
Separately, the US does have an obesity problem, and exercise would help, but the biggest issue by far is dietary sugar/carbohydrates.