The troops of Massachusetts are the first to die for the Union in the American Civil War (1861-1865). This war was between the United States of America (the Union) and the Confederate States of America (the Confederacy). One of the main issues was slavery; the Union was opposed to slavery. Abraham Lincoln was the President of the Union at this time.
Abraham Lincoln
http://sunsite.utk.edu/civil-war/warweb.html
http://etext.virginia.edu/civilwar/