<span>The voting age was decreased from 21 to 18 because it was thought this would lead to less protesting by students. Before the age was lowered, there were young men being drafted, but they were not old enough to vote.</span>
The most important detail would be the water and its preservation.
The western part of the United States is a region that has an ever-growing population. This has resulted in numerous environmental problems, that only seem to become bigger and more alarming as the time passes on.
The biggest problem of all is definitely the water, its usage, and its preservation. This region doesn't have big reserves of water, but despite that, the preservation and usage of the same is at a low level. Instead of planting crops or fruit trees that do not require lot of water, big portion of the farmlands are the total opposite, planted with highly demanding crops and fruit trees for water. Because of that, most of the groundwater has been already used, and that has been the largest source of freshwater in the region. The pollution of the rivers is also a big problem, because making the water not suitable for drinking, with having such small reserves, can easily lead to a disaster.
Perry help the United States expand its influence in Asia as he negotiated the first treaty between the United States and Japan (Kanagawa Treaty).
The Kanagawa Treaty was signed on March 31, 1854 between Commodore Matthew Perry of the United States and the authorities of Japan, in the Japanese port of Shimoda. This treaty ended with 251 years of Japan's isolation and, at the same time, with its policy of exclusion (Sakoku), thus opening the Japanese ports of Shimoda and Hakodate to trade with the United States, guaranteeing the safety of American shipwrecks and establishing a permanent consul.
Mathematics - Vedic literature is replete with concepts of zero, the techniques of algebra and algorithm, square root and cube root. Arguably, the origins of Calculus lie in India 300 years before Leibnitz and Newton.
Astronomy - Rig Veda (2000 BC) refers to astronomy.
Physics - Concepts of atom and theory of relativity were explicitly stated by an Indian Philosopher around 600 BC.
Chemistry - Principles of chemistry did not remain abstract but also found expression in distillation of perfumes, aromatic liquids, manufacturing of dyes and pigments, and extraction of sugar.
Medical science & surgery - Around 800 BC, first compendium on medicine and surgery was complied in ancient India.
Mechanical & production technology - Greek historians have testified to smelting of certain metals in India in the 4th century BC.
Civil engineering & architecture - The discovery of urban settlements of Mohenjodaro and Harappa indicate existence of civil engineering & architecture, which blossomed to a highly precise science of civil engineering and architecture and found expression in innumerable monuments of ancient India.
Shipbuilding & navigation - Sanskrit and Pali texts have several references to maritime activity by ancient Indians.Sports & games - Ancient India is the birth place of chess, ludo, snakes and ladders and playing cards.
