The two strong research questions on farming in the United States from the provided options are:
- What region of the United States is most important to its farming industry, and why?
- How does farming affect the United States' economy overall?
These questions allow for in-depth exploration and analysis of key aspects of farming in the United States. The first question encourages investigation into geographical influences and regional significance, while the second question invites an examination of economic impacts and contributions of farming to the broader economy.