Does USPS deliver from supplier to customer globally?

[TooBe]

Hi does anyone know if USPS will pick up from supplier (where ever he may be) and deliver to customer (where ever he may be) globally? Even if they are two different countries.
My VM2 site is built to sell products from many different manufacturers and suppliers and I would like the shipping to pick up from them each individually depending on whose product the customer buys... not me the website owner who has no products.  Is this possible with USPS?
or
if not any suggestions guys??
Thank you for any help as I am not in the know about northern hemisphere services.

Also Will USPS allow me to have an account if I dont live in America?

Thanks guys