The Atlantic Ocean and the Pacific Ocean. The term Manifest Destiny was first used by John O'Sullivan, a newspaper editor in 1845, to describe the prevailing American mindset that all lands from coast to coast are destined to belong to the United States. This mindset was reinforced by the Lewis and Clark Expedition in the early 1800s, which scouted out the American West and came into fruition with the completion of the transcontinental railroad in 1869.
too much government control
A major negative effect of the Progressive era was too much government control which led to political corruption in both the state and national level. Powerful politicians became overpowering to the interest of the public resulting in ineffective government
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