Why was the fall of constantinople a powerful symbol?

Which best explains parallel forces?

The original term of was descriptive of lower-class people who performed manual labor.

The picture below shows president richard nixon and the first lady standing before the great wall of china in 1972. they are smiling - as are the chinese with them. when this picture was shown on american television, americans were aware that it was a historic moment. what are two reasons why this moment was important for both china and the united states?