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US President Donald Trump and US First Lady Melania Trump arrive for the "Salute to America" Fourth of July event at the Lincoln Memorial in Washington, DC, July 4, 2019. (Getty Images)

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African American and white school children on a school bus, Charlotte, NC – 1973 (Library of Congress)

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Qatar Airways' first Airbus A380 is seen during a ceremony at Hamad International Airport in Doha, Qatar on September 18, 2014. (Getty Images)

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Christians offering prayers for the departed souls of their loved ones on the occasion of All Souls Day, at a cemetery on November 2, 2016 in Bhopal, India. (Hindustan Times/Getty Images)

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President Donald Trump and North Korean leader Kim Jong-un speak with reporters at the Korean Demilitarized Zone at Panmunjom, June 30, 2019. (White House)

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A rally held in Tehran on February 11, 2010 to mark the 31st anniversary of the revolution. (Getty Images)

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North Korean leader Kim Jong Un and U.S. President Donald Trump inside the demilitarized zone (DMZ) separating the South and North Korea on June 30, 2019. (Getty Images)