How has immigration changed since the 1960s?
immigration was high in the 1960s, and has gradually decreased.
immigration was low in the 1960s, increased until 2000, and then decreased.
immigration was high in the 1960s, decreased until 2000, and then increased.
immigration was low in the 1960s, and has gradually increased.

the debate held in 1980 by carter and reagan was decisive for the elections. while carter tried to convince people that reagan was a "war hawk", reagan put all his efforts in showing the necessity to take care about medicare and the social security advantage. this debate reagan to win the elections

. to apply pressure and persuasion to keep party members in the chamber in line.