The process by which campaigners learn which issues matter to potential voters and which candidates these voters prefer by conducting interviews on the telephone or in person is called a(n)

Canvassing

Explanation:

To canvas means to tally for votes in an election, it's a scenario where the candidate seeks to find how he can convince the audience or society to vote for him or her. This is been done by rally, community services, approaching towns and villages for seminar.

explanation:

with the profits from the european sales, merchants purchased europe's manufactured  goods, including tools and weapons. then the merchants shipped those manufactured  goods, along with the  american  sugar and rum, to west africa where they were bartered for  slaves.