What made the demand for oil rise in the 1850s?

kerosene was used for heat and the light

an earnest tone.

because portia wants to know why brutus has been acting strange lately.

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.