The difference is the mentality.
Most Americans are used to driving everywhere, even if it is 2 or 5 mile away to a store to pick up groceries.
In large American cities that have the mass transit available, you still have most motorized vehicles that have single occupant and no passenger.
Without a bike lane taking up the roads or streets, there will be just more cars, no reduction in drivers, no increase in mass transits usage.
Additionally, most Americans consider bikes, ebikes or motorcycles as toys; they don't belong on the roads, they are not considered alternatives to cars.