Which constitutional amendment did the supreme court most use in the 1870s-1890s to protect the rights of corporations-even though it had been written to protect individual rights?

"Due process" clause of the 14th amendment

The due process clause restricts the federal government. It states that no person shall be "deprived of life, liberty, or property without due process of law. It deals with the administration of justice and thus the due process clause acts as a safeguard against abuse of a person's rights