Because it was a slave-state that had pro-Confederate leaders, and could easily have seceded.
Also it was on the route between New York and Washington, and could have interrupted the movement of troops and supplies between the two centres.
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They were border states for the Union and Confederate. Maryland was especially important because it contained the U.S. capital (Washington D.C.)
Because it largely surrounded Washington DC. Virginia had already seceded. If Maryland did the same. the Capital would have been isolated inside Confederate territory. Maryland was a deeply divided state. There had been riots in Baltimore. Later, it would be shown that Lincoln's assassination had been plotted in a Maryland boarding-house. That is why Lincoln took drastic steps, arresting the pro-Southern leaders of the Maryland government, suspending Habeas Corpus as he did so. But the main task was accomplished. Maryland stayed in the Union.
The border between Maryland and Virginia is the Potomac River. Washington D.C. is on the north bank of the Potomac, on land ceded to the federal government by the Maryland. Thus, if Maryland had seceeded and joined the Confederacy, the Capital of the United States would have been in the middle of the Confederate States. Washington DC would have had to be evacuated and a new capitol, perhaps New York or Philadelphia might have been chosen. Also, Maryland had a large population, the port of Baltimore and farm products that would have helped the South.
little round top was so important because it was the extream left flank of thr union line and if the union was flanked they would of beem wiped out and would of lost Gettysburg
Because its conquest gave to Union the control of the Tennessee River.