Roman Christianity's organization was based on bishops' and archbishops' control of territorial units called diocese. The word diocese comes from a Greek word which means 'administration'. In the Middle Ages, some bishops even held political power aside from their religious power. A diocese is further divided into parishes which fall under the management of priests.
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It was the quest for westward expansion. The Manifest Destiny called for the US to fulfill the divine mission to expand and dominate the whole continent. After the independence, the US moved westward step by step: the Louisiana Purchase, Texas, the Mexican-American War. This last event allowed the US to increase its territory, incorporate California and reach the shores of the Pacific Ocean.
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