This is an essay about the New States Clause in the Constitution.
Luke–Acts is an attempt to answer a theological problem, namely how the Messiah promised to the Jews came to have an overwhelmingly non-Jewish church; the answer it provides, and its central theme, is that the message of Christ was sent to the Gentiles because the Jews rejected it.  This theme is introduced at the opening of the gospel of Luke, when Jesus, rejected in Nazareth, recalls that the prophets were rejected by Israel and accepted by Gentiles; at the end of the gospel he commands his disciples to preach his message to all nations, "beginning from Jerusalem." He repeats the command in Acts, telling them to preach "in Jerusalem, in all Judea and Samaria, and to the end of the Earth." They then proceed to do so, in the order outlined: first Jerusalem, then Judea, then Samaria, then the entire (Roman) world.