Final answer:
Eugene O'Neill is recognized as America's first master dramatist, a pioneer who significantly influenced the American dramatic theatre and received numerous accolades, including the Nobel Prize in Literature.
Step-by-step explanation:
The title of America's first master dramatist is often given to Eugene O'Neill, who is credited with elevating American dramatic theatre to a globally respected art form. O'Neill's career featured several phases, including realism and expressionism, influenced by figures such as philosopher Friedrich Nietzsche and playwright August Strindberg. America recognized his contributions to playwrighting with multiple awards, including the Nobel Prize for Literature in 1936 and four Pulitzer Prizes for different plays. Although Tennessee Williams and Arthur Miller are powerhouses in American theater, it is Eugene O'Neill who stands out as the pioneer, and therefore the correct answer would be Eugene O'Neill.