Normally USA warehouse supplier ships to the USA. Shipping from the USA to other countries is too high when compared to Shipping from China to other countries.
Aliexpress sellers have an option like Ships from the USA or Ships from China.
I know what you mean, I had the same problem with you before. Some customers will ask me whether the products base in US. But as we all konw, the fee of US warehouse are much higher than Chinese warehouse. Finally my current logistics partner found me inmmediately, and now, I ship all my products from China, and the website will show those in US when my customer is tracking. So they help me reduce the cost and win my customer's heart.
I think they can help you, my partner's e-mail is firstname.lastname@example.org