Case Study-Georgia
Once the Maine was in Havana Harbor, the newspapers protested to President McKinley that military action had not been taken. This would be spurred even more once the vessel would explode and sink in the harbor. It was requested once war was declared against Spain that Georgia field 3,000 soldiers to help the effort.
As far as training, "Georgia had perhaps the most training camps of any state, more than twenty-five in all, during the Spanish-American War. Albany, Athens, Atlanta, Augusta, Columbus, Griffin, and Macon each had one or more camps. The two most important camps, however, were Camp Onward in Savannah and Camp
Camp "Onward"
Thomas in the extreme northwest corner of the state. Savannah was selected as the point of embarkation for the Seventh Army Corps commanded by General Fitzhugh Lee. The corps began to move to Savannah in late October 1898. By the end of the month almost 13,000 men were camped in and around the Forsyth Park area of the old port city. The height of their stay in Savannah was the gigantic Thanksgiving Day dinner celebration hosted by the women of the city. Before shipping out for occupation duty in Cuba or Puerto Rico, the men of Camp Onward held a grand review on December 17 for President McKinley and Generals Lawton, Shafter, and Wheeler. A large banquet was then held at the old De Soto Hotel for the corps officers and visiting dignitaries.
Located on the site of the Civil War (1861-65) battlefield at Chickamauga, Camp Thomas was arguably both the largest training camp and the most deadly in the country. Established shortly before the war was declared, Camp Thomas would be the temporary home to more than 7,000 regular soldiers and to more than sixty regiments of state troops. The site as originally laid out simply could not support so many men concentrated in such a small and wild area. Overcrowding and poor sanitation led to a serious outbreak of typhoid, which caused 752 deaths. The camp was thoroughly investigated after the war, and the findings would have a major influence on military medicine for the next century. The use of female military nurses, improved hospital operations and camp-planning techniques, and sanitary hygiene courses for all personnel were just some of the positive outcomes resulting from the miseries that befell Camp Thomas."
http://www.georgiaencyclopedia.org/articles/history-archaeology/spanish-american-war-georgia
-Camp "Onward" pictured below-