Answer:
With the expansion of the Industrial Revolution in the U.K, they soon found out that they needed more raw materials to not only invent but also create their products. The Colonial Empire was located around the world, and was able to produce much of the needed natural material due to their suitable climates for different materials. These materials helped with the building of Great Britain, not only economically, but also militarily.
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<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.