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His emphasis on training and rehearsals with the Navy were critical to the success of CORONA recovery operations . Thus , Spanish control of writing , especially in the area of writing history , had consequences which were critical to the way the world perceived , and continues to perceive , the conquest and the indigenous peoples of the Americas . President Clinton told us , very late in the day , that congressional approval for fast-track legislation permitting him to negotiate new trade agreements was critical to the well-being of the United States . Cesar Chavez knew that both the owners and their employees were critical to the success of the larger whole but dialogue had not yet crossed that boundary of the system . The MADS-box genes , a family of transcription factors that are required for flower development , are known to have undergone an expansion through duplication that was critical to the evolution of angiosperm flowers . During the war it was occupied continually by Union forces , became a large supply depot and refugee haven , and was critical to the defense of eastern Kansas and the Midwest .