History of the Slovak language ). The usage of Czech in Slovak environment resulted to the Slovakized Czech language - a variant of cultural Czech with Slovak elements. This variant existed since the penetration of Czech to present-day Slovakia and was used e.g. in city books, official correspondence, etc. Early writings had a various frequency of Slovak elements caused by a poor knowledge of standard Czech among many Slovak native speakers, the influence of vernacular language and cultural Slovak. The normalized form of Slovakized Czech existed since the 17th century. In the normalized form, Czech letters and words were systematically replaced by their Slovak equivalents.
Native American Day 1998, the California Assembly passed AB 1953, which made Native American Day an official state holiday, observed annually on the fourth Friday in September. In 1997, the state of Nevada also declared the Fourth Friday of September as [Nevada Indian] Native American Day. In 1989, the South Dakota legislature unanimously passed legislation proposed by Governor George S. Mickelson to proclaim 1990 as the "Year of Reconciliation" between Native Americans and whites, to change Columbus Day to Native American Day and to make Martin Luther King's birthday into a state holiday. Since 1990, the second Monday in October has been celebrated