Why did congress pass a selective service act.

Selective Service System: History and Records
The obligation of a man to register is imposed by the Military Selective Service Act. The Act establishes and governs the operations of the Selective ...
http://www.sss.gov/backgr.htm

Selective Service Act - Wikipedia, the free encyclopedia
President Franklin Roosevelt signs the Selective Service Training Act. ... The Selective Service Act (or Selective Draft Act, 40 Stat. ...
http://en.wikipedia.org/wiki/Selective_Service_Act

Selective Service System - Wikipedia, the free encyclopedia
The Selective Service Act (40 Stat. 76) was passed by the Congress of the ... The Selective Training and Service Act of 1940 was passed by the Congress of ...
http://en.wikipedia.org/wiki/Selective_Service_System

Selective Service Act
The Selective Service Act was drafted by Brigadier General Hugh Johnson after the United States entered the First World War. The law authorized President ...
http://www.spartacus.schoolnet.co.uk/FWWselective.htm

The Congress passed the Selective Service Act in order to establish a system for the military draft during times of war or national emergency. This act was first passed in 1917 during World War I and has been modified and updated several times since then.

To get more information about the reasons behind the passing of the Selective Service Act, you can refer to the provided links. The links include resources such as the official website of the Selective Service System, Wikipedia articles on the Selective Service Act and System, as well as additional historical information on the subject.

By reading these sources, you will gain a deeper understanding of the historical context, political motivations, and societal factors that led to the passing of the Selective Service Act.