<span>I think he probably meant that the Constitution is not to be set in stone and should change to fit the times, which is my the Founding Fathers put in the Amendment process.
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"A constitutional door is left open" refers to the question of whether an action is constitutional or unconstitutional. There is gray area that needs to be discussed.
The retail industry helps producers sell their goods to a national market.
The other major manufacturers of the world stopped trading
The power of a court to hear a case first