Final answer:
The incorrectly capitalized word is 'United' in 'United states of America.' Both 'United' and 'States' should be capitalized as they are part of a proper noun.
Step-by-step explanation:
The word in the sentence that is incorrectly capitalized is "United" in the phrase "United states of America." Both words in the phrase should be capitalized since they are part of a proper noun referring to the name of a country.
According to the rules of capitalization, proper nouns, such as "United States of America," always have the first letter of each significant word capitalized unless they are used adjectivally or in certain other specific contexts.
Therefore, the correct phrase should be "United States of America."
Using parentheses, we can add an example to demonstrate how capitalizing proper nouns clarifies meaning: The country (United States of America) is known for its diverse landscapes and cultures.