April 19, 1775 - September 3, 1783
(8years, 4months and 15 days)
The National Reclamation Act directly affected the management of "A. Water," since it was thought that water was being both wasted an allowed to become infected with certain pollutants.
Yes, it is true that linguists do not know for certain how language was developed by early humans, but they're able to determine that it started somewhere in Africa, due to human migration patterns.
