What did New York journalist and armchair expansionist John L.O'Sullivan mean when he coined the term manifest destiny in 1845?

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John L.O'Sullivan believed that it was the God-given right of Americans to expand their civilization across the continent. He saw it as their duty to spread their superior way of life and government to the less civilized peoples of the west. This belief became known as manifest destiny and was used to justify the expansion of the United States in the 19th century.

What Did New York Journalist and Armchair Expansionist John L