Once you have enabled AI Servo mode and selected the correct focus points (if you want to adjust them from how the camera is currently set up), the only control you need is the shutter button -- just pressing this halfway will enable focus tracking on the focus points that are enabled.
The Social Security Act was enacted August 14, 1935. The Act was drafted during President Franklin D. Roosevelt's first term by the President's Committee on Economic Security, under Frances Perkins, and passed by Congress as part of the New Deal.
The taxation of Social Security began in 1984 following passage of a set of Amendments in 1983, which were signed into law by President Reagan in April 1983. These amendments passed the Congress in 1983 on an overwhelmingly bi-partisan vote.