Yes, they were effective and made their documents and the rights for the people.
The purpose of the Selective Service Act (1917) was to make sure that when the country goes to war, it has enough troops to win. The first Selective Service Act was enacted during the first world war. Its main purpose was to get men registered for the draft, which in turn forced men to go to war to meet troop demands.
Being one of the oldest constitutions, American Constitution endured many alterations after a great deliberation and pondering as per the needs of the society.
American constitution is very democratic and many rights and duties have been pronounced to safeguard the interest of the people.
American political system is Bicameral and the Central Government possesses exclusive powers and states were also given distinguished rights to exercise democracy in America. This is considered to be unique and stands as a role model for many other constitutions in this world.
It would be B.) <span>Australopithecus (approx. 2 million to 5 million years ago)
Since this is the first thing that happened compared to the other answers, it would be the first point in the timeline. :)</span>