Very few manufacturing facilities for the US would not also carry European approval. Generally speaking you can expect the medication to be as safe as it was before.
Obviously some firms perform better than others at inspections and not all drugs are in all markets… But it won’t be the wild west.
Well, then maybe we will be cured of the republican problem when boomers die and younger conservatives sacrifice their children to their emperor via antivaxxing.
Nature always finds a way.