Why is Samoa called Western Samoa?

it is called western Samoa because Samoa is divided into two parts, American Samoa and western Samoa.

After colonialism came to Samoa, America took control of Eastern Samoa which adapted the name "American Samoa". While Germany (and later NZ) took control of Western Samoa, who then took on the name "Western Samoa". No called SAMOA. The nation dropped the "western" in 1997.