"In the 1840 president James k Polk belief in manifest destiny led to the expansion of the United States, especially into Mexican territory, since he believed that the US was "destined" to occupy all the land from the Atlantic to the Pacific.
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3250 BCE it started in ancient Egypt or so
Following the war art generally moved away from realistic to "interpretational", since many artists were beginning to challenge the status quo of art that had existed for hundreds of years prior.