Could be two reasons, we just bought all of the mid-west and west, or there was rumors of the ocean far enough in the west. That's what the Lewis and Clark expedition was all about finding the pacific ocean beyond the Rockies. Unless you have a multiple choice?
Answer: Monarchy, where the divine right of kings establishes the political legitimacy of the rule of the monarch (king or queen); legitimacy also derives from the popular perception (tradition and custom) and acceptance of the monarch as the rightful ruler of nation and country.
Nobles resisted change.
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