Why is Gondor so important in the Lord of the Rings?

Gondor Calls for Aid gondor After the invasion of the fierce hordes of Balchoth, Gondor is on a brink of destruction The gondor lord of the rings After the defeat of Sauron, Gondor was ruled by Elessar, Heir of Isildur Gondor was the seat of the Dominion of Men in the beginning of the Fourth Age, and

what is gondor Gondor was the greatest kingdom of Men in Middle-earth, bordered by Rohan to the north, Harad to the south, the cape of Andrast and the Sea to the west, and