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The 20th century in the United States refers to the period in the United States from 1901 through 2000 in the Gregorian calendar. For information on this period, see: History of the United States series: History of the United States (1865–1918) History of the United States (1918–1945) History of the United States (1945–1964)
Maps of the New World had been produced since the 16th century. The history of cartography of the United States begins in the 18th century, after the declared independence of the original Thirteen Colonies on July 4, 1776, during the American Revolutionary War (1776–1783). Later, Samuel Augustus Mitchell published a map of the United States ...
20th-century architecture in the United States (20 C, 13 P) African-American history between emancipation and the civil rights movement (6 C, 194 P) American frontier (53 C, 313 P, 1 F)
The disputed land had generally been administered by Delaware, even electing a member of the Delaware legislature in the mid-19th century, [379] but federal maps had included the land as part of Pennsylvania at least as late as 1900. [380] The states had agreed on a resolution, and it was affirmed by an act of Congress on this date.
20th; 21st; 22nd; 23rd; 24th; 25th; Pages in category "20th-century maps and globes" The following 8 pages are in this category, out of 8 total.
Years of the 20th century in North America (108 C) * 20th century in Central America (24 C) 20th century in the Caribbean (43 C, 1 P) /
The progressive solution was the "open" primary by which any citizen could vote, or the "closed" primary limited to party members. In the early 20th century most states adopted the system for local and state races—but only 14 used it for delegates to the national presidential nominating conventions.
Then it sent surveyors to map and document the land. [71] By the 20th century, Washington bureaucracies managed the federal lands such as the United States General Land Office in the Interior Department, [72] and after 1891, the Forest Service in the Department of Agriculture. [73] After 1900, dam building and flood control became major ...