Indus Valley Civilization's ending in 1500 BCE has 2 theories:
Aryan Invasion Theory: Based on linguistic evidence (indo-germanic language family), archaeological evidence, and interpretation of passages from the Vedas, 19th century European scholarship formulated the Aryan invasion (or, at least, Migration) theory, suggesting that Indo-germanic tribes invaded and destroyed the Indus civilization and developed the Vedic culture.
Counter Theory: Infrared scanning, which indicates that the river Sarasvati disappeared in about 1900 BCE, and archaeological evidence which challenges theories suggesting a violent conflict gave rise to the hypothesis that the Vedic culture has its roots in today's northwest India.
Beginning of what is called Vedic Period
1500-1000 BCE:
Vedic Hymns are collected during Vedic Period
Later these hymns called the Vedas become the basic scriptures of Hinduism, which is a set of religions based in Indus Valley Civilization
Include Rig Veda, Sama Veda, Yajur Veda, and Atharva Veda
Early religion called Sanatana Dharma, or Vedism, begins based on Vedic Hymns
1000-500 BCE
Collection of Expositions, which include Brahmanas and Upanisads, which are also included in the scriptures of Hinduism
400 BCE - 400 CE:
Compilation of the Mahabharata
about 2 feuding families called the Kauravas and Pandavas who fight for a kingdom
includes a dialogue between Arjuna (the protagonist) and the Hindu God Krsna, which is told in the Bhagavad Gita, compiled from 200 BCE - 100 CE
Interpretations of Upanisads called Smriti, which includes Vedanta Sutras, Dharma Shastras, Yoga Sutras, and Smartas were compiled in this period
400 CE - 1200 CE:
A reformation period for Hinduism
Development of the six (orthodox) schools: Samkhya, Yoga, Vaisesika, Mimamsa, Sankara's Advaita Vedanta
New Interpretations of Vedanta by Ramanuja and Madhva
Formation of different Hindu sects, such as:
Vaishnavism-worship of the God Vishnu (5th-8th Centuries)
Shaivism - worship of the God Shiva (5th-8th Centuries)
1200 CE - Today:
Second Period of Challenge and Reaction to Hinduism
vaishnavism, a form of bhakti yoga, which worships Vishnu; focuses on spirituality rather than tradition and scripture
Period in which Nanak (founder of Sikhism), Ramananda, and Kabir were actively working to reform Hinduism
Chaitanya Movement in 16th Century began to worship aboriginal gods
Renaissance: 19th Century:
rebirth and revival in Hinduism
Brahma Samaj - a group formed in 1828 by Rammohan Roy to become liberated from customs
Arya Samaj - radical group formed by Dayananda Saraswati
reconversion - when Hindu people coverted to Islam or Christianity
20th Century
Sri Aurobindo - integral yoga and non-dualism
Radhakrishnan - Hindu universalism
Mahatma Ghandi - political and religious leader supporting non-violence