for political reasons are acceptable. (last paragraph)

o The NSA uses a huge number of computers to listen for "key words"
on "watch lists" for ALL border crossing traffic, including voice
conversations. That means in 1975 they could convert voice to text,
then do keyword searches against it. It's 1997 now.

Just how did United States citizens lose these Fourth Amendment rights,
granted by the Constitution? And why is the Military monitoring the
communications of Americans on U.S. soil and working with domestic law
enforcement?

Well, one day President Truman issued a secret order creating the NSA.

As testified by Library of Congress members on C-SPAN, the names of these
presidential findings change with administrations. They are called variously
Presidential Decision Directives, National Security Council Decision
Directives, Executive Orders, etc.

One might think these special override-the-constitution presidential
directives (which came out of nowhere) would be used for short-term
emergencies.

Wrong: the NSA is now a HUGE intelligence organization, eating billions
and