What is the origin of british common law?

Which of the following arguments did thomas paine include in common sense

1. what potential advantages could companies like standard oil offer consumers?

Which effect did the united states supreme court's decision in plessy v. ferguson have? 1. ending segregation in all public schools in america 2. protecting voting rights for african americans by eliminating literacy tests 3. upholding the rights of all citizens to be treated equally by the government 4. authorizing the system that kept black and white people separated