When did the federal courts finally begin to apply the basic rights provided in the constitution to the states?

I believe the answer is: After world war I

This occurence was most widely known as the incorporation of bill of right.
Bill of right was actually created in 1791, but not all the states were legally required to incroporate it to their laws.
The incorporation of bill of rights only started after the supreme court decision in 1920s following the world war I