When did the caste system evolve into a four tiered hierarchy?A.) when the Aryans ruled over the region - They arrived in 1500BC and developed the grouping of people based on their status and activities in life.
Patrick Henry encouraged colonists to fight for independence from britain in support of the patriot cause.
The scientific revolution occurred in the mid-1500s and represented a new way of thinking. During the Renaissance, there was an increased exploration of the world outside Europe, leading to the discovery of Africa, Asia and the Americas. These explorations expanded the European's understanding of religion and culture. Alongside the exploration, the creation of the printing press, the development of astronomy and mathematics were of great impact for the society.
Mankind's need to look closely into these new regions, to develop new tools, instruments and techniques to better explore and understand the world around them lead to the development, spread and great impact of the scientific revolution.