Answer:
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The Supreme Court case that found the use of the grandfather clause unconstitutional is the Guinn v. United States, 238 U.S. 347 (1915). In its decision, the Supreme Court ruled that the grandfather clause<span> exemptions to </span>literacy tests<span> were unconstitutional. It declared the grandfather clauses as </span><span>repugnant to the Fifteenth Amendment and therefore null and void.</span>
The factor that did not contribute to industrial revolution are the people who wanted to maintain feudalism to stay in power. I think the landlords who are used to this system and did not try to adapt wouldn't want that significant change.