How did the Buffalo influence native American life on the Great plains

What do you think was a drawback to this method of calculating distance

Which of the following best describes the economic effect that results from the government having a budget surplus?

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?