Final answer:
Robert Frost is the celebrated American poet known for creating a national interest in poetry, and he significantly influenced American literature with his blend of traditional forms and modern vernacular.
Step-by-step explanation:
The American poet who is widely recognized for creating a national interest in poetry and for being an iconic figure in the landscape of American literature is Robert Frost. Frost was a masterful poet whose contributions significantly influenced the way poetry was written and perceived in America. His recitation of "The Gift Outright" during the presidential inauguration of John F. Kennedy in 1961 marked a historic moment, cementing his status as a national treasure. Frost's poetry, recognized by its blend of traditional forms with the American vernacular, reflected the complexities of modern life and earned him four Pulitzer Prizes between 1924 and 1943. Furthermore, his legacy continues as he remains one of the most popular and venerated American poets to this day.