Final answer:
The best-supported inference from the given passage is that the author is concerned that America will become too divided to work together.
Step-by-step explanation:
The best-supported inference from the given passage is that the author is concerned that America will become too divided to work together.
The passage mentions the danger America faces in becoming a collection of interest groups, with each group seeking to satisfy private wants and conflicts arising between different groups and regions. The author asks who will speak for America and the common good if the nation becomes divided. These statements suggest a concern for division and a lack of unity in America.