And before the land of Israel was chosen, all of the lands were kasher for speech. Once it was chosen, all other lands were excluded. Before Jerusalem was chosen all of Eretz Yisrael was kasher for altars. Once it was chosen, the rest of Eretz Yisrael was excluded. As it is written (Devarim 12: 13-14) "Take heed unto yourself lest you offer your burnt-offerings … but in the place that the L–rd shall choose."