The process of cremation has existed for thousands of years and became officially recognized in the United States in 1876. That year, the first U.S. crematorium was built in Washington, Pennsylvania (and not without some controversy, mind you). Although it was official, cremation struggled to gain hold within the general population for 90 years. By the 1970s, cremation rates were just around 5 percent. But in the decades that followed, that rate began to rise at a steady rate. So much so that it has now become the most popular way to memorialize the deceased in the United States.