When did Oscar Krahnvohl write the poem my country?

There is no record of a poet named "Oscar Krahnvohl" or a poem titled "My Country" attributed to them. It is possible that you are misremembering the name or the title of the poem.

Could you please provide more information about the poem, such as the language it was written in, the period it was written, or any other details you remember? This might help identify the author and the poem.