Final answer:
The HR historically ended as late as 1914 with the onset of World War I. The legacy of civilization policies for Native Americans extended into the twentieth century, with the last boarding school closing in 1983 and laws protecting native rights passed in 1990. Civil rights activism and cases were not limited to the South in the 1950s and 1960s, as historians have uncovered numerous civil rights cases throughout the early 1900s.
Step-by-step explanation:
Some historians say that the HR (which stands for the historical period being referred to) ended as late as 1914, with the advent of World War I. Although the nineteenth century technically ended in 1900, its prevailing political, social, and cultural patterns persisted until the outbreak of the war.
The twentieth century witnessed further developments in civilization policies that affected Native American people in the United States. For example, the last boarding school for Native Americans closed in 1983, and laws enabling tribes to reclaim ancestral remains and sacred items passed in 1990.
Regarding civil rights and race relations, black history and civil rights activism were not limited to the South and the 1950s and 1960s, respectively. Historians have revealed that civil rights cases involving schools, restaurants, hotels, theaters, and other establishments occurred during every year of the early 1900s, with black plaintiffs winning in about a third of the cases discovered in the Midwest.