sentences:  Pubs were invariably closed on Sundays, until the various state Sunday Observance Acts were repealed during the 1950s and early 1960s.These restrictions created a small but lucrative black market in illegal alcohol, leading to the proliferation of illegal alcohol outlets in many urban areas; the so-called "sly grog shop".After the Federation of Australia in 1901, Australia's new constitution ruled that the Commonwealth of Australia had no power to legislate in this area, so each state enacted and enforced its own liquor licensing regulations.