; A Great Blue Heron The slave owners also argued that banning slavery in new states would upset what they saw as a delicate balance of free states and slave states They feared that ending this balance could lead to the domination of the federal government by the northern free states This led seven southern states to secede from the Union When the southern forces attacked a US Army installation at Fort Sumter the American Civil War began and four additional slave states seceded Northern leaders had viewed the slavery interests as a threat politically but with secession they viewed the prospect of a new Southern nation the Confederate States of America with control over the Mississippi River and parts of the West as politically unacceptable; . 2.3.1 Concourses a and B 6.1 Freedom suits and Dred Scott, 2006 89.7% 98,740 6.1% 6,744 Shrubs of the Potomac River Basin; . On June 12 1983 the Space Shuttle Enterprise arrived at Dulles atop a modified Boeing 747 after touring Europe and before returning to Edwards Air Force Base Two years later Enterprise returned and was placed in a storage hangar near Runway 12/30 to await construction of a planned expansion to the National Air and Space Museum Enterprise left Dulles on April 27 2012 for its new home at the Intrepid Sea Air & Space Museum in New York City. 6.1 Freedom suits and Dred Scott At the beginning of the war Washington's only defense was one old fort (Fort Washington 12 miles (19 km) away to the south) and the Union Army soldiers themselves. When Maj Gen George B McClellan assumed command of the Department of the Potomac on August 17 1861 he became responsible for the capital's defense. McClellan began by laying out lines for a complete ring of entrenchments and fortifications that would cover 33 miles (53 km) of land He built enclosed forts on high hills around the city and placed well-protected batteries of field artillery in the gaps between these forts, augmenting the 88 guns already placed on the defensive line facing Virginia and south in between these batteries interconnected rifle pits were dug allowing highly effective co-operative fire. This layout once complete would make the city one of the most heavily defended locations in the world and almost unassailable by nearly any number of men. John Jay New York 1 Yes Valley Forge and Monmouth Painting showing Washington and Lafayette on horseback in a winter setting at Valley Forge.
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