spheres and two purple spheres. The products consist of four green spheres and two purple spheres. This does not violate any of Dalton’s postulates: Atoms are neither created nor destroyed, but are redistributed in small, whole-number ratios. 15.4 The Union Triumphant Learning Objectives By the end of this section, you will be able to: Describe the reasons why many Americans doubted that Abraham Lincoln would be reelected Explain how the Union forces overpowered the Confederacy Describe the contributions and experiences of African Americans serving in the Civil War By the outset of 1864, after three years of war, the Union had mobilized its resources for the ongoing struggle on a massive scale. The government had overseen the construction of new railroad lines and for the first time used