Why has social media affected political campaigns? It is usually a quick and effective form of mass communication.
It is always a free way for politicians to advertise.
O It is often not an effective way for citizens to criticize policy ideas.
It is an effective way of communicating with the public without getting feedback.

it is usually a quick and effective form of mass communication

a historian researching the immigration policies of the early 1900s would expect a source written today,rather than in 1910 to :

( a ) be more interested in objective data and statistics.

the installment plan of the 1920s, an arrangement that allowed people to buy what they wanted with a small down payment and pay off the rest in monthly installments, provided americans a way to own what they did not have the money to buy.