This turned out pretty easy, but enjoy anyway.
The grandest of canyons is found within me;
few can match my nature's diversity.The continent's largest metropolis I boast,
along with a long stretch of Pacific coast.Beside me a massive saltwater gulf lies
and I possess some Caribbean isles.I think that these clues are sufficient, mates.
Tell me the name of these united states?
Looking for the name of a country.
I think the answer is:
United Mexican States
The grandest of canyons is found within me;
I think we are talking about the Copper Canyon
few can match my nature's diversity.
The nature of Mexico is very diverse
The continent's largest metropolis I boast,
Mexico city is the largest metropolis in North America
along with a long stretch of Pacific coast.
Beside me a massive saltwater gulf lies and I possess some Caribbean isles.
And it matches all the above due to its location
And, of course, all the above might probably apply to:
the USA but then it would have been too simple
