Hinduism came to the United States first in the American imagination and only second with emissaries and immigrants from India. The initial features of Hinduism that captivated North American audiences were those that were lauded for their compatibility with Protestant Christianity and those that were derided for their incompatibility with the same. The Hinduism that flourished in the North American context drew heavily from the neo-Vedantic theology of monism, which was propagated by Hindu reform movements in the 19th century. This monism drew on simplified Upaniṣadic teachings of the similitude of Ātman (the essence of self) and Brahman (the essence of the universe) and from this claimed that the same divinity comprises all of existence. Many of the early Hindu emissaries to the United States drew on ideological confluences between Christian and Hindu universalism. They diminished the importance of temple and domestic rituals, sacrifice, personal devotion to the multiplicity of Hindu deities, and priestly class and caste hierarchies among their North American audiences.
In the 20th century, increasing populations of Indian Hindus immigrated to the United States and began to challenge this narrative. These Hindus were not gurus or yogis who were interested in developing followings among white audiences. They were families concerned about maintaining their cultural and religious traditions. They also came from diverse regions of India, and they brought their sectarian and regional practices and devotions with them. After the 1965 Immigration and Naturalization Act, Indian Hindus worked diligently to create community networks by establishing temples and religious organizations. These religious spaces provided the infrastructure to maintain and further ethnic identities as well. In most cases, Hindu temples and organizations continue to be internally focused on providing resources to communities of Indian Hindus, such as language and scripture instruction, social support networks, ethnic food, and pan-Indian and regional festivals and events. While most temples are open to non-Indian Hindus, traditional Hinduism is not a proselytizing religion, and few non-Indians convert to Hinduism formally. ISKCON (International Society for Krishna Consciousness) temples are the only Hindu temples in the United States that sometimes have proportionate numbers of Indians and non-Indians worshipping together.
Outside traditional forms of home altars, temple worship, and festivals, there are many ways in which Hinduism has influenced American culture. The guru movements that flourished in the countercultural spiritual experimentation of the long decade of the 1960s continue to draw followers today. In fact, the guru field in the United States has diversified significantly, and many gurus have established successful ashram communities across the nation. Some gurus became mired in scandal in the 1970s and 1980s, but still they have survived and in some cases thrived. The New Age movement of the 1990s also brought rekindled interest in Hinduism, often recoded as Indian spirituality, and this has sponsored a new wave of gurus and their teachings and the rampant expansion of postural yoga practice in the United States.