26. Green currency
The government chose to color U.S. currency green as an anti-counterfeiting strategy. When the color was adopted in the 19th century, cameras could only take black and white photographs, making imitation bills difficult to produce.
27. Population concentration
Over half of the U.S. population lives in just nine states: California, Texas, Florida, New York, Pennsylvania, Illinois, Ohio, Georgia, and North Carolina.
28. Americans like to travel
The number of passports Americans held leaped to 21.4 million in 2017, the most ever recorded.
29. Belief in the individual
According to a recent Pew Research Center study, 57% of Americans believe that individuals control their own success in life, the largest share of any country surveyed.
30. Americans like to move
The United States is one of most mobile nations on Earth. According to a Gallup poll, 24% of U.S. adults reported moving within the country in the past five years.
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