What was the impact of physical geography on mesopotamia and it's early civilizations?

it affected it because the kingdoms (with trade) slowly got richer and richer.

during the 20th century, the role of the vice president has evolved into more of an executive branch position. now, the vice president is usually seen as an integral part of a president's administration and presides over the senate only on ceremonial occasions or when a tie-breaking vote may be needed.