The star/mullet of some type or another tends to appear a great deal in American official heraldry. It might be present in a lot of personal heraldry too. I think a star or stars are ubiquitous symbols of the US. Maybe they’re to the US what the lion is to British heraldry.
If you mean the stars in my arms, they actually reflect MacMillan heraldry (all old MacMillan arms have three stars; not all of them have a lion), not U.S. identity, at least in my design.