The right-wing, traditional conservative Buchanan omits huge parts of the background to the US wars -- the US' entire imperial drive to take over the Middle East and central Asia after the breakup of the USSR.
This is a key to understanding what's going on.
Famous US geo-strategist Zbigniew Brzezinski outlined the strategy in his famous book The Grand Chessboard, a book so famous it was essentially required reading in State Dept circles. It called for the US to control both the Middle East and the central Asian/Caspian Sea region. By doing that the US would control most of the world's oil resources and could thus control both Europe and east Asia/China.
The key to the Middle East was Iraq's oil wealth and central location. You know the story of the US lies to start the war and us committing wanton torture trying to maintain our occupation of that country.
In Afghanistan we deliberately chose war -- we rejected Taliban offers both before and after 9/11 to turn over Bin Laden for trial. We wanted that war and figured we could install a puppet gov't there and use it as a base to control all of central Asia.
Another one of Brzezinski's strong recommendations was to control Ukraine. So we funded a coup there and US soldiers openly train Ukrainian fascists with swastikas and other Nazi symbols on their helmets. Our next steps will be to attempt to push separatist movements in both Russia and China to balkanize those countries.
Buchanan's omission of our imperial plans and goals is a huge, glaring omission of this article.
and another good one for geo politics
https://www.amazon.com/Grand-Chessboard-American-Geostrategic-Imperatives/dp/046509435X
Zbigniew Brzezinski - advising US presidents since the 70's, god help us all.
Its a highly strategic area, fought over for centuries.
Read this book.
https://www.amazon.com/Grand-Chessboard-American-Geostrategic-Imperatives/dp/046509435X