Choose the sentence that best summarizes the paragraph. Explain why it is a good summary in the box. 1. On May 10, 1869, as the last spike was driven in the Utah desert, the blows were heard across the country. Telegraph wires wrapped around spike and sledgehammer transmitted the impact instantaneously east and west. In San Francisco and New York, wires had been connected to cannons facing outward across the ocean. When the signal from the spike came through, the cannons fired. The world was put on notice: the transcontinental railroad was completed and the world was alerted that America would quickly become more powerful. A. On May 10, 1869, the loud sound of cannons from wires in New York and San Francisco made America seem powerful. B. The transcontinental railroad made America more powerful and important across the world.