Final answer:
The underlined portion of the U.S. Constitution was included to prevent the development of a formal aristocracy and protect the government from foreign corruption.
Step-by-step explanation:
The underlined portion of the U.S. Constitution, specifically Section 9 Clause 8, was included by the authors to prevent the development of a formal aristocracy in the United States. This provision prohibits the granting of any titles of nobility and prevents government officials from accepting foreign grants of nobility. The intention was to protect the U.S. government from being corrupted by foreign powers and ensure that the country remained free from the influence of European nobility.