In this lesson we provide key dates in the time period when the modern-day U.S. outdoor, environmental, and conservation sectors where established from the early 1800s to the mid 1900s. We cover some well known history of our sectors, and then talk specifically about what else was happening in this time for marginalized communities in the U.S., including Black, Indigenous, Mexican, Chinese, and Japanese communities. We also touch on LGBTQIA+ history and disability justice history.