The Joetsu Shinkasnen history: Why was the Joetsu Shinkansen selected among many planned route?

Do you know why the Joetsu Shinkansen was selected as the construction route from among the many planned routes? And how was the route and the location of the stations on the Joetsu Shinkansen decided?
You will know more about the Joetsu Shinkansen in this video.
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