In what way does this quote prove that Greece had a lasting impact on the world?

Explanation:

Plato's impact to the ancient world was great. Apart his works on philosophy and science. His Academy that lasted until it was closed by the Byzantine Emperor Justinian during 529 CE almost 900 years.

a historian researching the immigration policies of the early 1900s would expect a source written today,rather than in 1910 to :

( a ) be more interested in objective data and statistics.

i confess that there are several parts of this constitution which i do not at present approve, but i am not sure i shall never approve them: for having lived long, i have experienced many instances of being obliged by better information or fuller consideration, to change opinions even on important subjects, which i once thought right, but found to be otherwise. it is therefore that the older i grow, the more apt i am to doubt my own judgment, and to pay more respect to the judgment of others.