Those who have watched the movie English Vinglish, the main character Sridevi asks this valid question while learning English. Why do we use the article ‘the’ with United States but when we say India the article vanishes? She says this a discrimination against India. She didn’t get the answer in the movie. Let’s try to find the answer today. Just click the link below.

The article ‘the’ is not used with the personal nouns (Names). For example we can’t say
‘The’ Ram is a good boy.
Here ‘the’ is incorrectly used because Ram is a personal noun.
Similarly India is the name of the country and therefore it is a personal pronoun. Hence, we can’t use the article ‘the’ with India.
Now let’s take up the case of the United States.
When we say United states, we mean the collection of many states. When there is a collection of anything, the use of article is permitted. But when we use America instead of the US, we can’t use the article ‘the’. Because, America is the personal noun.
The United States is a super power of the world. (‘The’ is used)
America is the super power of the world. (‘The’ is not used)
Similarly,
The United Kingdom is one of the most developed country in the world. ( The is used because of the adjective United)
England is one of the most developed country in the world. (The is not used because England is the personal noun)