Despite this, he recognized the strategic importance of connecting the country by rail and saw it as essential to the nation's expansion and prosperity. Similarly, his proposals did not immediately facilitate the construction of the project. Among them all, William Henry Seward, who served as Secretary of State under President Abraham Lincoln and President Andrew Johnson, would develop the most developed plan for the transcontinental railroad. 3. Seward had a vision primarily focused on diplomacy and foreign relations; the development of a transcontinental railroad would prove to be crucial by providing efficient transportation to the Pacific Coast. He believed Pacific trade would be the most contested prize in international affairs, vital for the United States to emerge as the new world power. 4. Unlike previous advocates, his ambitious plans gained traction in the Northern States during the 1850s, the South, on the other hand, still believed that these routes would only benefit the North. It was only when the South began seceding from the Union in 1861 that supporters of the Sewards plan would muster enough votes to be able to bring it to reality.