Final answer:
The question is not clear without further context or information.
Step-by-step explanation:
The question asks whether the United States is on the flat-of-the-curve. However, this phrase is not clear in its meaning and there is no context given. Therefore, it is difficult to provide a specific answer. The term 'flat-of-the-curve' could refer to various concepts in different subjects. Please provide more information or clarify the question so that I can help you better.