<p>It does seem like World/International rankings pays more attention to popularity of international presence at these institutions, which inturn translates into population/popularity contest.
Their rankings has less parameters that has to do with quality and outcome of education as USNEWS or FORBES does.
So, if academic reputation/quality/satisfaction after graduation is your goal, and you want to attend school in the US, then avoid the world ranking as it will most likely be misleading.
Best of luck to you.</p>