What did Robert Frost write about in his poetry?

I think he wrote about the common people of America.

You are correct, Robert Frost is well-known for writing poetry about the common people of America and the rural New England landscape. To determine this, first, you could read some of Frost's poetry to gain an understanding of the themes and subjects he explores. Many of his poems focus on the daily lives, struggles, and experiences of ordinary individuals. Additionally, Frost often portrays the beauty and significance of nature, particularly the landscapes and characters found in rural New England. By examining these elements in his poetry, you can grasp his focus on the common people and the connection between humanity and nature in his work.