Final answer:
The Republican policies during the Civil War, such as the Homestead Act and Pacific Railroad Act, were focused on promoting economic growth and infrastructure by incentivizing western settlement and improving national transportation and education.
Step-by-step explanation:
The Republican 'investment' policy during the war, specifically during the Civil War era, included several key pieces of legislation such as the Homestead Act, the Pacific Railroad Act, the issuance of greenbacks, and the establishment of Land Grant Colleges. These initiatives were aimed at promoting economic growth and infrastructure. The Homestead Act helped foster agricultural expansion in the west by offering land to settlers, fostering a 'free soil' mentality against the spread of slavery. The Pacific Railroad Act provided funds for the construction of a transcontinental railroad, enhancing transportation and commerce. The issuance of greenbacks stimulated the Northern economy by creating a boom, though it also led to inflation. Lastly, the Land Grant Colleges Act helped advance education in agricultural and mechanical arts, hence improving agricultural productivity and technical skills.