Do all Americans wear shoes indoors?

If people regularly clean their homes I don't see how it would be unsanitary enough to make an issue about it, but some people are messy/dirty so I guess that would make sense. I am American and sometimes I wear my shoes up to my bedroom when I get home and then change to slippers or flip-flops and other times like if it is raining I'd change into them downstairs so I didn't get any water or mud in the house, but if I was having guests over I would keep my shoes on as they are a part of the clothes I am wearing. If I entered someone else's house I think the polite thing to do is watch what they do and then follow what they do out of respect for how they run their home. I have had asian friends who say they take their shoes off every time they enter someone else's house out of respect for their friend or family's homes. So I guess it depends on the person's culture too.