Selling US made items back to the US - tariffs

Anyone know for certain  if US made items or antiques being sold and shipped back to the US are subject to the same tariffs as items made outside of the US?  I have several old Rookwood vases, made in the US to sell.

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There no longer is any guarantee of anything when it comes to items shipped from Canada to USA. 

However, any made in USA items must have documentation that verifies the country of origin, and age of the items, otherwise said items "could" be subject to tariffs.