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| 1901 | New York State Tenement House Law. The legislative basis for the revision of city codes that outlawed tenements such as the "Dumbbell Tenement." Lawrence Veiller was the leading reformer. |
| 1902 | U.S. Reclamation Act. Created fund from sale of public land in the arid states to supply water there through the construction of water storage and irrigation works.ash, |
| 1903 | Letchworth constructed. First English Garden City and a stimulus to New Town movement in America (Greenbelt Towns, Columbia, etc.).sword |
| 1903 | President Theodore Roosevelt appoints a Public Lands Commission to propose rules for orderly land development and management.y=y |
| 1906 | Antiquities Act of 1906: First law to institute federal protection for preserving archaeological sites. Provided for designation as National Monuments areas already in the public domain that contained "historic landmarks, historic and prehistoric structur |
| 1907 | Founding of New York Committee on the Congestion of Population. Fostered movement, led by its secretary, Benjamin Marsh, to decentralize New York's dense population.sh, |
| 1907 | President Roosevelt establishes an Inland Waterway Commission to encourage multipurpose planning in waterway development: navigation, power, irrigation, flood control, water supply. |
| 1908 | White House Conservation Conference. State governors, federal officials, and leading scientists assemble to deliberate about the conservation of natural resources.lash, |
| 1909 | First National Conference on City Planning in Washington, D.e |
| 1909 | Daniel Burnham's Plan of Chicago published. First metropolitan plan in the United States. (Key figures: Frederick A. Delano, Charles Wacker, Charles Dyer Norton.)h 8ଠ|
| 1909 | Possibly the first course in city planning in this country is inaugurated in Harvard College's Landscape Architecture Department. Taught by James Sturgis Pray.v |
| 1911 | Frederick Winslow Taylor publishes The Principles of Scientific Management, fountainhead of the efficiency movements in this country, including efficiency in city government. |
| 1912 | Walter D. Moody's "Wacker's Manual of the Plan of Chicago" is adopted as an eigth-grade textbook on City Planning by the Chicago Board of Education. Possibly the first formal instruction in city planning below the college level.bitm |
| 1913 | A chair in Civic Design, first of its kind in the U.S., is created in the University of Illinois's Department of Horticulture for Charles Mulford Robinson, one of the principal promoters of the World's Columbian Exposition. |
| 1914 | Flavel Shurtleff writes Carrying Out the City Plan, the first major textbook on city planning. |
| 1914 | Panama Canal completed and opened to world commerce.7 |
| 1914 | Harland Bartholomew, eventually the country's best known planning consultant, becomes the first full-time employee in Newark, New Jersey, of a city planning commission. |
| 1915 | Patrick Geddes, "Father of Regional Planning" and mentor of Lewis Mumford, publishes Cities in Evolution. |
| 1916 | Nelson P. Lewis published Planning of the Modern City.l |
| 1916 | Nation's first comprehensive zoning resolution adopted by New York City Board of Estimates under the leadership of George McAneny and Edward Bassett, known as the "Father of Zoning." |
| 1916 | National Park Service established with sole responsibility for conserving and preserving resources of special value. |
| 1917 | Frederick Law Olmsted, Jr. becomes first president of newly founded American City Planning Institute, forerunner of American Institute of Planners and American Institute of Certified Planners.b |
| 1918 | U.S. Housing Corporation and Emergency Fleet Corporation established. Influenced later endeavors in public housing. Operated at major shipping centers to provide housing for World War I workers.t |
| 1919 | Three early unifunctional regional authorities--the Metropolitan Sewerage Commission, the Metropolitan Water Board and the Metropolitan Park Commission--combined to form the Boston Metropolitan District Commission.3 |
