In the history of American labor, the United Mine Workers of America has occupied a position of unquestioned leadership. The UMWA led the struggle to establish collective bargaining in American industrial life in the twentieth century. Its principles and policies, its strength and unity, and its outstanding leaders have been an inspiration to generations of working families for over one hundred years. The richness of the UMWA's history is a testament to the firm determination imbedded in the hearts and minds of the coal miners of North America to build and maintain a strong, enduring union. The UMWA was founded in Columbus, Ohio in 1890 by the merger of Knights of Labor Trade Assembly No. 135 and the National Progressive Union of Miners and Mine Laborers. The constitution adopted by the delegates to the first UMWA convention barred discrimination based on race, religion or national origin. The UMWA founding fathers clearly recognized the destructive power of discrimination at a time when racism and ethnic discrimination were accepted facts in some parts of American culture. The delegates also called for miners to obtain a fair share of the wealth they created "fully compatible with the dangers of our calling." The delegates pledged "to use all honorable means to maintain peace between ourselves and employers; adjusting all differences, as far as possible, by arbitration and conciliation, that strikes may become unnecessary."