What are the hymns?
According to the Royal Academy of the language, hymns, is the plural of the word hymn, which means: emblematic musical composition of a collectivity, which identifies it and links between those who interpret it. And it is that we usually associate the hymns, with those songs, that identify, patriotic way, to a nation or country in particular.
That Yes, under a historical understanding, the hymns are one of most ancient, poetic forms that exist. These arise with ancient civilizations, who created hymns or choral compositions, which was sung in praise of these gods. Part of these civilizations are the Greek, mainly, as also the Roman. Who, before the birth of Christ, already made and sang hymns, in gratitude for favors done for their gods. Even until today, many times they can be understood as hymns, praise exalting the God which Christians and Catholics profess in general.
With the passage of time, these hymns were mutating, types of hymns mentioned first. Or how the hymns are understood today. As music, highly formal compositions, which exalt the patriotism, honor, and gallantry of a nation in particular.
So, as these hymns are called national anthems. Every country that exists on Earth, has a national anthem. Since these are, as stated above, values it exaltations of all patriotic and national gallantry. These national anthems, born in a literary manner and by a person in particular. I.e., they are not usually group creations. But who are born spontaneously by a writer or musician, as a tribute to the nation where he was born person.
Many of these national anthems are created at the dawn of the birth of the homeland, as an independent nation. The hymns are the exaltation culminate a patriotic feeling, facing independence conquered, a kind of colonialism or internal oppression of that nation. So, as for example many of the hymns in South America, are born after that every country of the continent, is independent of the Spanish Crown.
On the other hand, we have the national anthem of the United States, who was born shortly after, when that nation has won its freedom, the domain served by the English Crown.
So, as the national anthems, a literary form, which speak of beauty in the country concerned, the beauty of its people, the courage of its people and powerful way, praises a libertarian sentiment against any oppression (real or perceived) that has been victim homeland before the creation of the anthem, as also against future oppression which it could exercise.