"Israel captured the West bank in a war."Israel captured it from Jordan in 1967, which had taken it in 1948. Jordan's occupance was recognized by practically noone. Up until that time, it had been part of the British Mandate of 1922, which was an international effort to create a Jewish state.
"The territory now known as the West Bank was a part of the British Mandate of Palestine entrusted to the United Kingdom by the League of Nations after World War I. The terms of the Mandate called for the creation in Palestine of a Jewish national home without prejudicing the civil and religious rights of the non-Jewish population of Palestine. During that time the area was called by the historic names of its two regions -- Judea and Samaria." http://en.wikipedia.org/wiki/West_bank#History
"Judea (from the Hebrew: יהודה, "Tribe of Judah") was the name of the mountainous southern part of the historic Land of Israel." http://en.wikipedia.org/wiki/Judea
"Samaria (Hebrew: שֹׁמְרוֹן) is a term used for a mountainous region roughly corresponding to the northern part of the West Bank. [..] "Samaria" derives from an ancient city of the same name, which was located near the south of Samaria, and was the capital of the Kingdom of Israel." http://en.wikipedia.org/wiki/Samari