Why is it important that congress have the power to regulate interstate commerce

implied powers are necessary to carry out expressed powers. Why has the power to regulate interstate commerce become such an important power of Congress? The definition of interstate commerce has expanded to give Congress authority over virtually everything that crosses state lines.

no options provided, here,but the answer to this question is often: a historian cites a japanese newspaper article published a year after the end of world war ii in order to draw conclusions about the effect of the war on the japanese economy.

clearly from the answer, the historian alludes to historical sources,and records to aid in analyzing and drawing conclusion on the effect of the war on the economy of japan.