The idea that Americans need to return to the isolationist policies of 100+ years ago is ludicrous. It's also not possible to do so. As long as American corporations are doing business all over the world, it's not possible to withdraw from the global economy and restrict those corporations to "America first".
In 1917, the US population was a little over 107 million people. There's more than three times that number today. And the same policies which gave rise to American business, also lead to the stock market crash and the Great Depression.
What made America the richest country in the world wasn't isolatipnism, it was globalism. It was supplying the Allies in WWII, and keeping them supplied while they rebuilt Europe after the war. It was trade unions that built the middle class. All of the things that Republicans hate, made America great.
You can never return to the past. Everything is different today. Things are very different from when I grew up in the 1950's. To suggest going backwards is simplifying the obvious. What worked then will not work today. The technology, communications and business methods of the early 20th century are archaic by today's standards. How we interact and view other countries and cultures has evolved. Too much has changed, including the people and what they expect.
This interview wasn't what I expected at all. Bannon is longing for a past that never was and willing to destroy America's future to achieve it.