I am biased as US runner but we should have world records from the 800m to the 10000m. We should be winning gold in every single middle and long distance events. The probabilities that this can happen with a population of 332 million are too high for this not to happen. We need to strive for excellence and not just "happy to be here" BS.
We have the largest farm system in the world with highschool athletes, USATF, etc... yet we still suck at championship meets. We have the best facilities. The biggest budgets. Best social media presence to attract more athletes. The best olympic kits (as shown by multiple US athletes on Youtube). Much larger pool to pluck talent. Best everything but results in races that matter.
We just don't have the depth in the few events we have a shot.