Samoa is an independent country, so like most countries it has a national anthem. It is called the Banner of Freedom.
Amerika Samoa (American Samoa)
Samoa's motto is 'Samoa is founded on God'.
Samoa Tula'i
Sauni I'iga Kuresa
they raise the flag infront of a building called faletalimalo where they play the national anthem celebrating independence day.
Nigeria's national anthem is called ''Arise, O Compatriots'' :)
The French national anthem is called "la Marseillaise".
The Portuguese national anthem is called A Portuguesameaning The Portuguese.
Asia is a continent comprising many countries. It there for does not have a 'national' anthem
Its called the National Anthem, and will depend upon which country you are referring to.
The Moroccan National Anthem is called the "Cherifian Anthem" and the lyrics (as well as an audio recording) can be seen here: National Anthems: Morocco.