Establishment is always relative matter of age plus power and even a sickly irrelevant establishment is still an establishment. Landowning nobility were still a

Establishment is always relative matter of age plus power and even a sickly irrelevant establishment is still an establishment. Landowning nobility were still an establishment even when industrialists were making more money for centuries and respectable families had to marry in overseas tycoons for money. The United States is an upstart compared to European nations which existed for millennia. Google is still fundamentally young even though they have grown older. Pedantically I would use "the" for the current eldest establishment with any power and "an" for any that are newer and even eclipsing.