The track can fully handle 20 Amps, but because of field installation conditions such as the quality of existing building wiring, track distance run, number of connections, etc., it is common practice to de-rate the track by 20%.
The 4th Amendment, one of the most contraversial amendments ever drafted, was added to the Bill of Rights on December 15, 1791. The idea of being secure in your home, however, goes back into the Pre-Revolutionary period.
Ratification by those states was secured - Virginia on June 25 and New York on July 26 - and the government under the Constitution began on March 4, 1789. For subsequent amendments, Article Five describes the process of a potential amendment's adoption.