I’ve always associated the Sons of Tarshish with Spain and their conquering in the New World, with expansion throughout the Americas.
Understand your thinking. Mine was that the U.S. (not Americas) was actually born out of the UK, not Spain. Also, the UK had a powerful maritime force as well, though later than Spain. From the M.E. it would take longer travel by sea to get to the UK. The close relations & alliance between the UK and the U.S., in more recent times, far surpass those with Spain, especially in the M.E.
Also, China is not mentioned?