What is significant about the sinkings of the RMS Lusitania and the William P. Frye? They strengthened the United States' opposition to joining the war.
They caused the United States to halt trade with the Allied Powers.
They increased tensions between the United States and Germany.
They led the United States to immediately declare war against Germany.

the answer is option a.

answer: to communicate with people on the other side.

explanation:

the tallest building in the western hemisphere and the sixth tallest building in the world

on august 14, 1935, the social security act established a system of old-age benefits for workers, benefits for victims of industrial accidents, unemployment insurance, aid for dependent mothers and children, the blind, and the physically handicapped.