To force someone to serve in the military

Which of the following was probably the most difficult challenge facing construction of the railroad?

How did agitators on both sides of the slavery issue make things worse? by putting out bounties on certain peopleby committing murderthrough their writingsby compromising on too many things

Between 1820 and 1860, the united states received a huge number of immigrants from european nations. on the map, identify the state where the most immigrants moved in search of jobs.