| Flap 1 | Flap 2 |
| 1921 | New Orleans designates the Vieux Carre Commission, the first historic preservation commission in the U.S.-powerp |
| 1922 | Los Angeles County Regional Planning Commission created. First of its kind in the United States. (Hugh Pomeroy, head of staff.) |
| 1922 | Inauguration of Regional Plan of New York under Thomas Adams |
| 1922 | Pennsylvania Coal Co. v. Mahon. The first decision to hold that a land use restriction constituted a taking. The U.S. Supreme Court (Brandeis) noted "property may be regulated to a certain extent, [but] if regulation goes too far it will be a taking regul |
| 1923 | Ground broken for construction of Mariemont, Ohio, in suburban Cincinnati. Mary Emery was its founder and benefactor; John Nolen, the planner. Some of its features (short blocks,mixtureofrentalandowner-occupied housing) foreshadow the New Urbanism movemen |
| 1924 | U.S. Department of Commerce under Secretary Herbert Hoover issues a Standard State Zoning Enabling Act. |
| 1924-28 | Sunnyside Gardens, a planned neighborhood designed by Clarence Stein and Henry Wright, is built by City Housing Corporation under Alexander Bing in Queens, New York.sh, |
| 1925 | Publication of "Regional Plan" issue of Survey Graphic, influential essays on regional planning by Lewis Mumford and other members of the Regional Planning Association of America (e.g., Catherine Bauer). |
| 1925 | Cincinnati, Ohio, becomes first major American city officially to endorse a comprehensive plan. (Alfred Bettman, Ladislas Segoe). |
| 1925 | Ernest Burgess's "Concentric Zone" model of urban structure and land use is published. |
| 1925 | In April, The American City Planning Institute and The National Conference on City Planning publish Vol. 1, No. 1 of City Planning, ancestor of present-day Journal of the American Planning Association. |
| 1926 | Village of Euclid v. Ambler Realty. Constitutionality of zoning upheld by the U.S. Supreme Court. (Case argued by Alfred Bettman.). |
| 1928 | U.S. Department of Commerce under Secretary Herbert Hoover issues a Standard City Planning Enabling Act |
| 1928 | Robert Murray Haig's monograph "Major Economic Factors in Metropolitan Growth and Arrangement" is published in Volume I of The Regional Survey of New York and Its Environs. Viewed land use as a function of accessibility. |
| 1928 | Construction of Radburn, New Jersey, begun. Planned community inspired by Howard's Garden City concept and designed by Stein and Wright. A forerunner of the New Deal's Greenbelt towns |
| 1929 | Clarence Perry's monograph on the Neighborhood Unit is published in Volume VII of The Regional Survey of New York and Its Environs. |
| 1929 | Wisconsin law, first instance of rural zoning, authorized county boards "to regulate, restrict and determine the areas within which agriculture, forestry and recreation may be conducted." |
| 1929 | Stock market crash in October ushers in Great Depression and fosters ideas of public planning on a national scale.# |
| 1931 | National Land Utilization Conference convened in Chicago. Three hundred agricultural experts deliberate on rural recovery programs and natural resource conservation. |
| 1932 | Federal Home Loan Bank System established to shore up shaky home financing institutions. |
| 1932 | Reconstruction Finance Corporation established at the outset of the Great Depression to revive economic activity by extending financial aid to failing financial, industrial, and agricultural institutions. |
| 1933 | FDR inaugurated. New Deal begins with a spate of counter-depression measures. |
| 1933 | Home Owners Loan Corporation established to save homeowners facing loss through foreclosure. |
| 1933 | The National Planning Board established in the Interior Department to assist in the preparation of a comprehensive plan for public works under the direction of Frederick Delano, Charles Merriam, Wesley Mitchell. Its last successor agency, the National Res |
| 1933 | Civilian Conservation Corps established to provide work for unemployed youth and to conserve nation's natural resources. |
| 1933 | Federal Emergency Relief Administration set up under Harry Hopkins to organize relief work in urban and rural areas. |
| 1933 | Tennessee Valley Authority created to provide for unified and multipurpose rehabilitation and redevelopment of the Tennessee Valley, America's most famous experiment in river-basin planning. Senator George Norris of Neb fathered idea, DavidLilie implement |
| 1934 | American Society of Planning Officials founded, an organization for planners, planning commissioners and planning-related public officials. |
| 1934 | National Housing Act. Established FSLIC for insuring savings deposits and the FHA for insuring individual home mortgages. |
| 1934 | Taylor Grazing Act is passed, its purpose to regulate the use of the range in the West for conservation purposes. |
| 1934 | "Final Report" by the National Planning Board on its first year of existence. Includes a section entitled "A Plan for Planning" and an account of the "Historical Development of Planning in the United States." |
| 1935 | Publication date of Regional Factors in National Planning by the National Resources Committee, a landmark in regional planning literature. |
| 1935 | Soil Conservation Act. Congress moves to make prevention of soil erosion a national responsibility. |
| 1935 | The Historic Sites, Buildings and Antiquities Act, a predecessor of the National Historic Preservation Act, passed. Requires the Secretary of the Interior to identify, acquire, and restore qualifying historic sites and properties and calls upon federal ag |
| 1935 | Social Security Act passed to create a safety net for elderly. Frances Perkins, Secretary of Labor and first woman cabinet member, was a principal promoter.kwav |
| 1935 | Congress authorizes construction of the Grande Coulee Dam in Central Washington State. Finished in 1941, it is the largest concrete structure in the U.S. and the heart of the Columbia Basin Project, a regional plan comparable in its scope to TVA. The proj |
| 1936 | Hoover Dam on the Colorado River completed. Creates and sustains population growth and industrial development in Nevada, California, and Arizona. |
| 1937 | Our Cities: Their Role in the National Economy. A landmark report by the Urbanism Committee of the National Resources Committee. (Ladislas Segoe headed research staff.) |
| 1937 | U.S. Housing Act (Wagner-Steagall). Set the stage for future government aid by appropriating $500 million in loans for low-cost housing. Tied slum clearance to public housing. |
| 1937 | Farm Security Administration established, successor to the Resettlement Administration and administrator of many programs to aid the rural poor. |
| 1938 | The American Institute of Planners, purpose:".the planning of the unified developoment of urban communities and environs, and of states, regions, nation, as expressed through determination of the comprehensive arrangement of land uses, occupancy, and regs |
| 1939 | Homer Hoyt's influential "sector theory" of urban growth appears in his monograph, The Structure and Growth of Residential Neighborhoods in American Cities.kwav |
