Why did the mutual admiration that the U. S. and Iran once had for each other
break down?

Iran and the United States have had no formal diplomatic relations since April 1980. Pakistan serves as Iran's protecting power in the United States, while Switzerland serves as the United States' protecting power in Iran.

Explanation:

the first 10 amendments to the u.s. constitution are known as the bill of rights. those 10 amendments establish the most basic freedoms for americans including the rights to worship how they want, speak how they want, and assembly and peaceably protest their government how they want. the amendments have also been subject to much interpretation since their adoption, particularly the right to carry a gun under the second amendment.

"a bill of rights is what the people are entitled to against every government on earth, general or particular, and what no just government should refuse, or rest on inference," said thomas jefferson, the author of the declaration of independence and the third president of the united states.