What causes variations in climate and vegetation in most of the united states and canada

powers  are  denied  to the  national governmentin three distinct ways: some  powers, such as the  power  to levy duties on exports or prohibit the freedom of religion, speech, press, or assembly, are expressly  denied  to the  national government  in the  constitution.

people had jobs and began to work. that’s why the commercial revolution was great.

the answer to your question is

transform it from an expensive luxury to a mid-priced good