The United States of Subcontinent is a fictional country, and therefore does not have an official national anthem. However, a potential national anthem for this country could be:

Verse 1:
From the mountains to the sea
Our land is rich and free
With diversity and unity
We stand as one, eternally

Chorus:
O United States of Subcontinent
Our home, our heart, our pride
We pledge our lives, our souls
To keep you strong and free

Verse 2:
From the Indus to the Ganges
Our people thrive and grow
With wisdom from the past
And hope for the future, we go

Chorus:
O United States of Subcontinent
Our home, our heart, our pride
We pledge our lives, our souls
To keep you strong and free

Verse 3:
With courage and determination
We face the world as one
With justice, liberty, and equality
We march towards the sun

Chorus:
O United States of Subcontinent
Our home, our heart, our pride
We pledge our lives, our souls
To keep you strong and free