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.

By the late 1920s Potter and her Hill Top farm manager Tom Storey had made a name for their prize-winning Herdwick flock.

By the 1920s, composers of Tin Pan Alley and Broadway used ballad to signify a slow, sentimental tune or love song, often written in a fairly standardized form ( see below ).

By the late 1920s, New York writers other than Fitz Gerald were starting to use " Big Apple " and were using it outside of a horse-racing context.

By the 1920s, the emerging middle and working classes were powerful enough to elect a reformist president, Arturo Alessandri Palma.

By the 1920s, many newspapers had a comics page on which many strips were collected together.

Additional milieu were provided by Chaosium with the release of Dreamlands, a boxed supplement containing additional rules needed for playing within the Lovecraft Dreamlands, a large map and a scenario booklet, and Cthulhu By Gaslight, another boxed set which moved the action from the 1920s to the 1890s.

By the early 1920s, unit operations became an important aspect of chemical engineering at MIT and other US universities, as well as at Imperial College London.

By the late 1920s, Al Capone and the Mob were inspiring not only fear, but piquing mainstream curiosity about the American underworld.

By the 1920s, the U. S. reached what is still its era of greatest-ever output, producing an average of 800 feature films annually, or 82 % of the global total ( Eyman, 1997 ).

By the 1920s Lewis Fry Richardson's interest in weather prediction led him to propose human computers and numerical analysis to model the weather ; to this day, the most powerful computers on Earth are needed to adequately model its weather using the Navier – Stokes equations.

By the 1920s, the idea of an Israelite conquest of Canaan-the story of the book of Joshua-was not supported by the archaeological record.

By the 1920s, Hearst, was the owner of a chain of newspapers from coast to coast.

By the 1920s, the diatonic harmonica had largely reached its modern form.

By the 1920s however the Senate had lost much of its original influence, and hence no sitting senator had been known to have serious aspirations of becoming prime minister whilst remaining in the Senate.

By the 1920s the number of cars had soared to 60, 000.

By the early 1920s, however, the inherent limitations of this type of engine had rendered it obsolete, with the power output increasingly going into overcoming the air-resistance of the spinning engine itself.

By the 1920s psychoanalysts assumed that homosexuality was pathological and that attempts to treat it were appropriate, although psychoanalytic opinion about changing homosexuality was largely pessimistic.

By the late 1920s the resistance movement against colonial rule had gathered widespread support during the mistreatment of the Samoan people by the New Zealand administration.

By the late 1920s, however, those employing only optical and electronic technologies were being explored.

By the late 1920s, economic performance had stabilised, but the overall situation was disappointing, for Britain had clearly fallen behind the United States and other countries as an industrial power.

By the 1920s, however, this boisterous folksiness had diminished.

By the end of the 1920s Corbusier was already an internationally known architect.

By the 1920s, the British Government were seeking a replacement for their book code systems, which had been shown to be insecure, and which proved to be slow and awkward to use in practice.

" By the 1920s, Birmingham was the 19th largest city in the U. S and held more than 30 % of the population of the state.

By the next month, there will certainly be no event.

By no means certain, but certainly possible, is an origin in the large islands of Samoa, namely Savaii.

By 1903, he already looked and lived like a wealthy young burgher, and he certainly earned the income of one.

By his own account Lilburne received the first ten years ' of his education in Newcastle, almost certainly at the Royal Free Grammar School.

By the 610s he was certainly in Mercia, under the protection of king Cearl, whose daughter Cwenburg he married.

By 1569 there had certainly been Readers for more than a century.

By this time, Augustus was certainly ready for peace, but Charles felt that he would be more secure if he could establish someone more pliable on the Polish throne.

By contrast, resentment and negative comments certainly resulted when the independently wealthy Talbot, who had spent a considerable amount of money in developing his calotype process ( about £ 5, 000, equivalent to £ as of ), did not make a similar general gift of it to mankind, or at least to his own countrymen, but opted to emulate Daguerre's UK policy and require the purchase of licenses for its use.

By the end of the seventeenth century, however, the work tended to be abbreviated to include only " the most sensational episodes of torture and death " thus giving to Foxe's work " a lurid quality which was certainly far from the author's intention.

By 1845 Attleborough certainly dominated the surrounding parishes with a population of nearly 2, 000, and in that year the railway ( Norwich to Brandon ) arrived.

By 1420, Bernardo was certainly down in Florence and apprenticed to one of that city's better-known sculptors, perhaps Nanni di Bartolo, called " il Rosso ( the redhead ).

By the end of the century, Western Tibet lay under the effective control of imperial officials ( almost certainly Tibetans ) dependent on the ' Great Administrator ', while the kingdoms of Guge and Pu-ran retained their internal autonomy.

By pure chance, Jonah sights a NATO airfield, Lajes Field, which has certainly been attacked, but which is mostly intact.

By 1512 Sebastian was certainly employed by Henry VIII as a cartographer at Greenwich.

By September 1, 2001, the Afghan Northern Alliance was a defeated force, and after the assassination of Ahmed Shah Masood on September 9, certainly not the basis of a national government ( 33-35 ).

:" By the ' Establishment ', I do not only mean the centres of official power — though they are certainly part of it — but rather the whole matrix of official and social relations within which power is exercised.

By now, it had become clear that these islands were desolate and quite useless, and certainly not the Terra Australis.

By this step she avoided any public affront to the dead king, which, owing to the embitterment of the people, would certainly have found expression at the interment.

By 27 January, the Illustrated Times noted that " a chance playgoer will certainly not find a seat at the Gaiety .... Thespis can, after all, boast the success which was predicted ".

By " 12 million defectives ", DeJarnette was almost certainly referring to ethnic minorities, as there have never been 12 million mental patients in the United States.

By 1450 it had certainly ceased to function as originally intended, and only the core of the alliance under Scanderbeg and Araniti Comino continued to fight on.

By the 1960s, Muslims had become openly dissatisfied with this system, aware that their own higher birthrate and the higher emigration rate among Christians had by this time almost certainly produced a Muslim majority, which the parliamentary distribution did not reflect.

By 1801, Macarthur was the largest sheep rearer in the colony, although he was certainly not the only landowner to have experimented with the breeding of fine-wooled sheep.

By this method they not only confiscate, but they confiscate arbitrarily ; and, while the process impoverishes many, it actually enriches some ... Lenin was certainly right.