Final answer:
Facts and statistics are the most effective evidence in an essay about the increase in population of the United States
Step-by-step explanation:
The most effective type of evidence to use in an essay about the increase in the population of the United States over the last ten years would be facts and statistics. This type of evidence provides objective information that can support the main points and arguments of the essay. For example, the essay could include statistics from the U.S. Census Bureau to show the actual increase in population numbers over the specified time period.
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