Think of it this way: the talent will make its way to create a product, in or outside of the US. If the US immigration insist that the country doesn't need the

Think of it this way: the talent will make its way to create a product, in or outside of the US. If the US immigration insist that the country doesn't need the talent, they just create a competition in another country. Promoting US citizens just because they are US citizens may work for a while, but I doubt that it is a good long-term strategy.