Fort Sumter in Charleston, South Carolina
CREDIT: “Charleston, S.C., Federal squadron dressed with flags for the anniversary of Maj. Robert Anderson’s surrender (1861) seen from a parapet of Fort Sumter.” Selected Civil War photographs, 1861-1865, Library of Congress.
"The Government of the Confederate States has hitherto forborne from any hostile demonstration against Fort Sumter, in the hope that the Government of the United States, with a view to the amicable adjustment of all questions between the two Governments, and to avert the calamities of war, would voluntarily evacuate it." — Beauregard in a dispatch to Anderson before the battle. Aides delivered messages to the island in hopes of avoiding conflict.
"Whereas the laws of the United States have been and are opposed in several States by combinations too powerful to be suppressed in the ordinary way, I therefore call for the militia of the several States of the Union, to the aggregate number of 75,000, to suppress said combination and execute the laws." -- Abraham Lincoln, April 15, 1861. In direct response to the Confederacy firing on Fort Sumter, Lincoln called for troops to prepare for war.
http://www.loc.gov/item/cwp2003000788/PP/
 

Fort Sumter in Charleston, South Carolina

CREDIT: “Charleston, S.C., Federal squadron dressed with flags for the anniversary of Maj. Robert Anderson’s surrender (1861) seen from a parapet of Fort Sumter.” Selected Civil War photographs, 1861-1865, Library of Congress.

"The Government of the Confederate States has hitherto forborne from any hostile demonstration against Fort Sumter, in the hope that the Government of the United States, with a view to the amicable adjustment of all questions between the two Governments, and to avert the calamities of war, would voluntarily evacuate it." — Beauregard in a dispatch to Anderson before the battle. Aides delivered messages to the island in hopes of avoiding conflict.

"Whereas the laws of the United States have been and are opposed in several States by combinations too powerful to be suppressed in the ordinary way, I therefore call for the militia of the several States of the Union, to the aggregate number of 75,000, to suppress said combination and execute the laws." -- Abraham Lincoln, April 15, 1861. In direct response to the Confederacy firing on Fort Sumter, Lincoln called for troops to prepare for war.

http://www.loc.gov/item/cwp2003000788/PP/