As of July 31, 2018 the National Debt of the US government totaled $21.4 trillion, $6.25 trillion of which was held by foreign investors in the form of US Treasury securities. Can you guess which countries account for the greatest amount of foreign investor held US debt?
Source: Wikipedia & US Treasury dept
Hint: Think countries where wealthy individuals maintain large holdings in addition to huge economies.
Cayman Islands and Bermuda aren't countries. Hong Kong is given and these probably should be also, or change the quiz instructions from naming "countries".