In the 1950s, Illinois enacted legislation requiring trucks to have curved mud flaps. There was no federal law about mud flaps at the time, but the Illinois statute was enacted because state legislators asserted that the curved mud flaps were more effective in preventing accidents than the straight mud flaps. Several trucking companies brought suit, because the Illinois statute conflicted with the laws of other states that required straight mud flaps. Was the Illinois statute constitutional.

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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the correct answer is a: slaves from other colonies ran away to georgia.

the lines on a surface map are called isobars. isobars are lines of constant pressure which are measured in units called millibars. the numbers indicate the amount of air pressure, in millibars, that each line represents.