Question: when did las vegas become a gambling town
[{'answer': '1931'}, {'answer': 'In 1931'}, {'provenance': [{'wikipedia_id': '2087269', 'title': 'History of Las Vegas', 'start_paragraph_id': 22, 'start_character': 0, 'end_paragraph_id': 22, 'end_character': 676, 'bleu_score': 0.982060959997838, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2903992024175952748}, 'section': 'Section::::1930–1941: Hoover Dam and the first casinos.\n'}]}, {}, {'provenance': [{'wikipedia_id': '2087269', 'title': 'History of Las Vegas', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2903992024175952748}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '15040772', 'title': 'History of Nevada', 'section': 'Section::::Twentieth century.:Gambling.\n', 'start_paragraph_id': 46, 'end_paragraph_id': 46, 'meta': {'evidence_span': ['During the Great Depression in the United States, Nevada legalized gamblingterming it "gaming"in 1931; (the Northern Club received the first license). At the', 'During the Great Depression in the United States, Nevada legalized gamblingterming it "gaming"in 1931; (the Northern Club received the first license).', 'Because of hostility from miners and their sympathizers, Nevada\'s territorial and state antigambling laws were mostly unenforced from 1859 until the Comstock Lode mining booms collapsed in the 1870s. After 1881, the state attempted to restrict gambling through licensing and other statutory controls. Opponents of gambling and prostitution became organized and in the Progressive Era at last persuaded state legislators to prohibit gambling statewide in 1910 as part of a nationwide anti-gaming crusade. During the Great Depression in the United States, Nevada legalized gamblingterming it "gaming"in 1931; (the Northern Club received the first license). At the time, the']}}]}, {'provenance': [{'wikipedia_id': '2095158', 'title': 'Downtown Las Vegas', 'section': 'Section::::History.\n', 'start_paragraph_id': 7, 'end_paragraph_id': 7, 'meta': {'evidence_span': ['he year 1931 was a pivotal one for Las Vegas. At that time, Nevada legalized', 'Eleven years later, members of the LDS Church chose Las Vegas as the site to build a fort halfway between Salt Lake City and Los Angeles, where they would travel to gather supplies. The fort was abandoned several years afterward. The remainder of this fort can still be seen at the intersection of Las Vegas Boulevard and Washington Avenue at the Old Las Vegas Mormon Fort State Historic Park. Las Vegas was founded as a city in 1905, when 110 acres of land adjacent to the Union Pacific Railroad tracks were auctioned in what would become the downtown area. In 1911, Las Vegas was incorporated as a city. The year 1931 was a pivotal one for Las Vegas. At that time, Nevada legalized']}}]}, {'provenance': [{'wikipedia_id': '21216', 'title': 'Nevada', 'section': 'Section::::History.:Statehood (1864).:Gambling and labor.\n', 'start_paragraph_id': 47, 'end_paragraph_id': 47, 'meta': {'evidence_span': ['e Great Depression, Nevada again legalized gambling on March 19, 1931,', 'Unregulated gambling was commonplace in the early Nevada mining towns but was outlawed in 1909 as part of a nationwide anti-gambling crusade. Because of subsequent declines in mining output and the decline of the agricultural sector during the Great Depression, Nevada again legalized gambling on March 19, 1931,', "Unregulated gambling was commonplace in the early Nevada mining towns but was outlawed in 1909 as part of a nationwide anti-gambling crusade. Because of subsequent declines in mining output and the decline of the agricultural sector during the Great Depression, Nevada again legalized gambling on March 19, 1931, with approval from the legislature. Governor Fred B. Balzar's signature enacted the most liberal divorce laws in the country and open gambling. The reforms came just eight days after the federal government presented the $49 million construction contract for Boulder Dam (now Hoover Dam). The Nevada Test Site, northwest of the city of Las Vegas, was founded on January 11, 1951, for the testing of nuclear weapons. The site consists of"]}}]}]