Who was the 18th president

food chain i would say only because there is competition on getting food and survival

no every country is held to the same degree as others just some member countries such as the usa and germany are more economically sound so the need to show there support to all others  

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.