No, the U.S. should remain as a whole
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Cultural and regional diversity are strengths
America has long been famed as the land of the free and a home for all kinds of people. For centuries, immigrants from around the world, as well as a legacy of slavery, have guaranteed the United States as a culturally diverse place.
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Though not in the Constitution, many Americans would agree that diversity is a fundamental strength of the United States and is not something to be underestimated. In fact, a new poll says that 60% of the nation believes diversity is a strength, with 75% of Republicans and 50% of Republicans within that data. Diversity is not necessarily a party issue. Diversity in terms of cultural differences from a wide range of immigrant populations across the nation, as well as diversity in terms of regional differences even within “American” culture. If the country were to separate across these fault lines, whether it be race, ethnicity, political affiliation, region, or any other suggested break, a crucial piece of the American identity would be lost. Americans themselves often tie America’s greatest qualities to its own diversity and it may even make the populace smarter and more open to change. Diversity is not a smooth road, no one argues such, but it is a road that leads to increased empathy and understanding across a populace. 
Cultural and regional diversity are strengths, but not at the cost of progress. Those who would argue for ethnic or racial homogeneity are hardly true Americans, but it is a fair desire to hope for a country that can agree on political issues enough to make real last change. If America’s “diversity” is forcing the country to stay stagnant, then it is not truly a strength. Instead, if the country were to break into smaller regions, individuals could relocate to those smaller regions based on their own values, not on any other diversity marker.
Rejecting the premises