A Brief History of Urbanism in North America: 1910-1919
The second decade of the twentieth contrite saw urban planning become increasingly codified and professionalized. Here are some key events:
Wacker's Manual of the Plan of Chicago 1912

As such, in 1912, Wacker published Wacker's Manual of the Plan of Chicago (by Walter D. Moody) for use in public schools. The text was adopted as an eighth-grade textbook by the Chicago Board of Education and was required reading for all eighth-grade public school students until 1924. This is the first known formal instruction in city planning below the college level. It offered students a basic understanding of the history and function of cities and taught the importance of planning as a civic responsibility.
Hadacheck v. Sebastian 1915

The case is significant because it is the first time the Supreme Court approved the regulation of the location of land uses. The brickyard was prohibited because it was causing adverse health effects in LA. In its decision the Court noted that: "There must be progress, and if in its march private interests are in the way they must yield to the good of the community."
Cities in Evolution 1915

In 1915 he wrote Cities in Evolution : An Introduction to the Town Planning Movement and to the Study of Civics. The book was an essay on the growth of cities emphasizing preservation of historical traditions, involvement of the people in their own betterment and the rediscovery of past traditions of city building.
Eutopia, then, lies in the city around us; and it must be planned and realised, here or nowhere, by us as its citizens—each a citizen of both the actual and the ideal city seen increasingly as one.
—Cities in Evolution
First Full-Time City Planner 1916

Bartholomew created new methodologies and new designs and concepts known as comprehensive planning which made contributions that remain relevant to urban planning in North America today—for good and for bad. Due to his groundbreaking work he is often described as the father of North American city planning. His legacy in urbanist circles is mixed, however, as he pushed for widened streets and strict Euclidean zoning.
Bartholomew passed away in 1989, a few months after his 100th birthday.
First Zoning Ordinance 1916
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The New York City 1916 Zoning Resolution was the first zoning ordinance in the United States. It was a measure adopted primarily to stop massive buildings such as the Equitable Building from preventing light and air from reaching the streets below. The ordinance, drafted by attorney Edward Bassett covered the entire city and controlled land use, building height and setbacks.
As a result of the resolution, new buildings were required to withdraw progressively at a defined angle from the street as they rose, in order to preserve sunlight and the open atmosphere in their surroundings. The effort to place restrictions on land use in New York City led to the Standard State Zoning Enabling Act, a key piece of legislation in the history of zoning. The act became the blueprint for zoning in the rest of the country, and was accepted almost without change by most states.
The setback code led to adoption of styles such as that of the Chrysler Building and Empire State Building with tiered architecture in its top floors. By the 1960s, many architects had responded to the code by adopting the plaza style of architecture, in which vertical buildings rose from the middle of a concrete plaza.
American City Planning Institute 1917

The institute under went a major reorganization and changed its name to the American Institute of Planners (AIP) in 1939 It joined with the American Society of Planning Officials (ASPO) in 1978 to form the American Planning Association (APA).
This American Institute of Planners was primarily concerned with public policy and legislation in city planning, and its influential opinion was sought regarding planning legislation at local, state and national levels. It also sough to define the nature of the profession of city planning through enforcing strict criteria for membership and developing guidelines for regarding various professional issues.
Today, the American Institute of Certified Planners (AICP), The American Planning Association's professional and educational component, continues this role by certifying planners, providing continuing education, and promulgating a code of ethics. This is now the group that provides national certification for city planners through the combined qualifications of work experience, training and passing of a written exam.
