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D.) Separation of Power

Explanation:

The Declaration of Independence gives to people power to alter the Government if need be. Instead of giving all power to the government.

in 1803 the louisiana purchase took place, doubling the size of the country. by 1840 almost 7 million americans had migrated westward in hopes of securing land and being prosperous. the belief that settlers were destined to expand to the west is often referred to as manifest destiny.

explanation:

popular sovereignty   influenced the declaration of independence because the colonists wanted to have freedom to do they wanted so they put into writing