By the 1920s, each state in the United States had passed public laws that stipulated a certain day to be Arbor Day or Arbor and Bird Day observance.

The disease was named after the Brazilian physician and infectologist Carlos Chagas, who first described it in 1909, but the disease was not seen as a major public health problem in humans until the 1960s ( the outbreak of Chagas disease in Brazil in the 1920s went widely ignored ).

In China, Mao Zedong in the 1920s used revolutionary slogans and paintings in public places to galvanise the country's communist revolution.

The dramas of Munk were mostly performed and made public during the 1930s, although many were written in the 1920s.

At the same time, the 1920s were known as the " Jazz Age ", and the public showed considerable enthusiasm for cars, air travel, the telephone and other technological advances.

In the early 1920s, ADAC Eifelrennen races were held on public roads in the Eifel mountains.

As an organized movement, Humanism itself is quite recent – born at the University of Chicago in the 1920s, and made public in 1933 with the publication of the first Humanist Manifesto.

The carbon microphone was also used in radio broadcasting and public address work through the 1920s.

Radiotelephony by 1920s began to displace radio telegraphy for many applications and was the basis of public broadcasting.

During the 1920s and the Great Depression years, Americans began to support the idea of public ownership of utilities, particularly hydroelectric power facilities.

Following artistic repression and public condemnation by the state in the 1920s, many within literary and public circles, at home and abroad, thought she had died.

Fundamentalists in the 1920s devoted themselves to fighting the teaching of evolution in the nation's schools and colleges, especially by passing state laws that affected public schools.

Despite the failure of the committee to solve the issue, public sentiment in the 1920s was in favour of fixing the flag problem for Canada.

The development was stopped by the Fascist Italianization which started in the 1920s and persecuted all public and private use of Slovene language.

He remained a very popular entertainer into the 1920s and performed regularly on radio, but his style started to sound more and more dated to the public as his career continued into the 1930s.

Clayton has had public water and sanitary sewer service since the 1920s.

Louisiana educator Morris N. Abrams attended public schools in Sikes during the 1920s and 1930s.

Alcoa's early developers considered public parks an essential part of the city, and in the 1920s, ALCOA sought to set aside of land for parks for every 100 people living in the city.

From the 1920s to the 50's Lake Stevens was primarily a resort community, with many public and private resort beaches scattered around the shore.

The critic Richard Morrison writes, " Reith's BBC of the 1920s was ... imbued with an almost religious zeal for ' enlightening ' the public through the magical medium of the wireless.

He had conducted for the fledgling BBC in an orchestral concert at Covent Garden in 1924, where he conducted the first public performance of the BBC Wireless Orchestra and for the Royal Philharmonic Society at the Queen's Hall in the 1920s and 1930s.

Fagging was officially abolished in the 1920s, and Marlborough was one of the first public schools to do so.

The 1920s saw gangsters, including Al Capone, battle law enforcement and each other on the streets of Chicago during the Prohibition era.

This may refer to the Prohibition in the 1920s, when the U. S. government decided to ban all alcohol.

Prohibition generally came to an end in the late 1920s or early 1930s in most of North America and Europe, although a few locations continued prohibition for many more years.

Prohibition was a major reform movement from the 1840s into the 1920s, and was sponsored by evangelical Protestant churches, especially the Methodists, Baptists, Presbyterians, Disciples and Congregationalists.

Smuggling revived in the 1920s during Prohibition, and drug smuggling became a major problem after 1970.

Early on during the 1920s Prohibition in the United States, the American journalist and student of American English H. L. Mencken noted :" The origin of the ... Tom-Collins ... remains to be established ; the historians of alcoholism, like the philologists, have neglected them.

< imagemap > File: 1920s decade montage. png | From left, clockwise: Third Tipperary Brigade Flying Column No. 2 under Sean Hogan during the Irish Civil War ; Prohibition agents destroying barrels of alcohol in accordance to the 18th amendment, which made alcoholic beverages illegal throughout the entire decade ; In 1927, Charles Lindbergh embarks on the first nonstop flight from New York to Paris on the Spirit of St. Louis ; A crowd gathering on Wall Street after the 1929 stock market crash, which led to the Great Depression ; Benito Mussolini and Fascist Blackshirts during the March on Rome in 1922 ; the People's Liberation Army attacking government defensive positions in Shandong, during the Chinese Civil War ; The Women's suffrage campaign leads to numerous countries granting women the right to vote and be elected ; Babe Ruth becomes the iconic baseball player of the time .| 420px | thumb

Prohibition in the United States began January 16, 1919, with the ratification of the Eighteenth Amendment to the U. S. Constitution, effective as of January 17, 1920, and it continued throughout the 1920s.

Disgust with corruption, waste, and traditional politics stimulated the Progressive movement, 1890s – 1920s, which pushed for reform in industry and politics and put into the Constitution women's suffrage and Prohibition of alcohol ( the latter repealed in 1933 ).

Drive-by shootings have been employed by gang members and organized crime, since the Prohibition era of the 1920s in the United States.

Marshals arrested the infamous Dalton Gang in 1893, helped suppress the Pullman Strike in 1894, enforced Prohibition during the 1920s, and have protected American athletes at recent Olympic Games.

During the Prohibition era of the 1920s, the village was a local hotbed of bootlegging and gambling, although it faced vigorous opposition from the mayor, Mary McFadden.

But with their new partner, Arnold " The Brain " Rothstein, they turned to bootlegging during Prohibition in the early 1920s.

Alternatively, a slightly different drink is claimed to have been invented in the 1920s during Prohibition, by an " Old Man Bishop " in a local community named Long Island in Kingsport, Tennessee ..

The violence escalated during the 1920s, as Prohibition was implemented.

Prohibition was established during the 1920s with the enactment of the 18th Amendment, which banned the distribution of alcoholic beverages.

The stereotypical image and myth of the American gangster is closely associated with organized crime during the Prohibition era of the 1920s and 1930s.

Many decades later, Samuel Bronfman founded Distillers Corporation Limited, in Montreal, which enjoyed substantial growth in the 1920s, in part due to Prohibition in the United States.

Bugsy Malone is a 1976 British musical gangster film, very loosely based on events in Chicago from the early 1920s to 1931 in the Prohibition era, specifically the exploits of gangsters like Al Capone and Bugs Moran, as dramatized in cinema.

This fostered the building of a rather wilder concentration of nightlife than Los Angeles would tolerate, and in the 1920s a number of nightclubs and casinos moved in along the Strip, which attracted movie people to this less-restricted area ; alcohol was served in back rooms during Prohibition.

In the 1920s the public flaunting of Prohibition laws, mob violence, and police involvement in illegal activities led Mayor W. Freeland Kendrick to appoint Brigadier General Smedley Butler of the U. S. Marine Corps as director of public safety.

The American barman fled 1920s Prohibition in the U. S. to head the Savoy's bars ; author of The Savoy Cocktail Book and inventor of such cocktails as the " White Lady ".

During the Prohibition days of the 1920s, while still teenagers, Reles and friend Martin " Buggsy " Goldstein went to work for the Shapiro brothers, who ran the Brooklyn rackets.

The Shelton Brothers Gang and Charles Birger gangs operated in Southern Illinois in the 1920s during Prohibition.