On Jan. 1, 2018, recreational marijuana became legal in California, making it the sixth state to legalize weed for non-medical use -- though marijuana remains illegal at the federal level and subject to the strictest penalties. But weed hasn’t always been considered a dangerous drug. In fact, hemp was widely grown by early American farmers and included as an additive to medicines in the 1800s. It wasn’t until the arrival of Mexican immigrants in the 1910s that public attitude began to change. In this Lowdown lesson, students will analyze the current and historical laws around marijuana usage in the United States.