Why president Lincoln supported the pacific railroad act of 1862?

President Lincoln supported the Pacific Railroad Act of 1862 primarily to promote westward expansion and facilitate economic development. He believed that a transcontinental railroad would enhance trade, connect distant regions, and unify the nation, especially during the Civil War. Additionally, the railroad would provide strategic advantages by improving transportation for troops and supplies. Lincoln saw the act as a means to encourage settlement in the West and to integrate the growing nation.