How is a scientific poll a better representation of public opinion than a straw poll?

What were the economic, religious and social/political factors in the abolition of slaves

What emperor was given credit for having the aqueducts built

Began during presidency of john q. adams tariff of 1828 and 1832 states’ rights versus federal authority john c. calhoun’s ‘proclamation to the people of south carolina’ concluded during the presidency of andrew jackson is which event are these characteristics describing