Question: In how many wars has the United States employed the recruitment method that was protested by Thomas E. O'Donnell?

full_context: Document 1: John McCunn: John H. McCunn (Nov. 2, 1820–Jul. 6, 1872) belonged to a poor Irish immigrant family who arrived in New York City in the 19th century. He worked as a dockhand before training as a lawyer, and eventually becoming a judge. When the American Civil War began in 1861 he joined the Union Army as a Captain in the 69th New York Infantry Regiment before he recruited the 37th New York Infantry which he commanded as colonel. At war's end he was brevetted Brigadier General. He was a member of the infamous Tweed Ring, which he aided by naturalising new citizens to boost his election rolls. On one day alone, he naturalised over 2,000 new voters. However, when the scandal was uncovered, he was impeached and removed from office.
Document 2: Robert Charles riots: The Robert Charles riots of July 24-27, 1900 in New Orleans, Louisiana were sparked after African American laborer Robert Charles fatally shot a white police officer and escaped arrest. A large manhunt for him ensued, and a white mob started rioting, attacking blacks throughout the city. The manhunt for Charles began after an altercation involving Charles, his roommate, and several New Orleans police officers on Monday, July 23, 1900, and ended when Charles was killed on Friday, July 27. A total of 28 people were killed in the riots, including Charles, shot by a special police volunteer. Other white men in the mob shot hundreds of bullets into his body and beat him beyond recognition. More than 50 people were wounded in the riots, including at least 11 who had to be hospitalized. Blacks made up most of the fatalities and casualties.
Document 3: Myles O'Donnell: Myles O'Donnell was an Irish American bootlegger and mobster during the Roaring Twenties in Chicago during Prohibition. He was most famous for being the founder of the West-side O'Donnell Mob aka the Westside O'Donnells or West-side gang (no relation to the South Side O'Donnells, a rival gang).
Document 4: Selective Draft Law Cases: Arver v. United States, 245 U.S. 366 (1918) , also known as the Selective Draft Law Cases, was a United States Supreme Court decision which upheld the Selective Service Act of 1917, and more generally, upheld conscription in the United States. The Supreme Court upheld that conscription did not violate the Thirteenth Amendment's prohibition of involuntary servitude, or the First Amendment's protection of freedom of conscience.
Document 5: Tomas Young: Tomas Young (November 30, 1979 – November 10, 2014) was an American military veteran of the Iraq War. He was paralyzed by a bullet to the spine while deployed in Iraq. One of the first veterans to come out publicly against the war, he spent most of his life after the war protesting. Young's condition worsened due to various medical complications and he chose to go into hospice care, awaiting his death. He later reversed that decision.
Document 6: Draft lottery (1969): On December 1, 1969, the Selective Service System of the United States conducted two lotteries to determine the order of call to military service in the Vietnam War for men born from 1944 to 1950. These lotteries occurred during a period of conscription from just before World War II to 1973.
Document 7: Thomas E. O'Donnell: Thomas E. O'Donnell (1841 – c. 1875) was one of the driving forces in the New York City draft riots, when he was 22 years old. He was a public opponent of the draft, so he was promptly arrested. Though his jail time is unknown, it is known that he died at age 34 due to heart problems.
Document 8: Selective Service System: The Selective Service System is an independent agency of the United States government that maintains information on those potentially subject to military conscription. Virtually all male U.S. citizens and male immigrant non-citizens between the ages of 18 and 25 are required by law to have registered within 30 days of their 18th birthdays and must notify Selective Service within ten days of any changes to any of the information they provided on their registration cards, like a change of address. A 2010 GAO report estimated the registration rate at 92% with the names and addresses of over 16.2 million men on file. However, the only audit of the addresses of registrants on file with the Selective Service System, in 1982, found that 20–40% of the addresses on file with the Selective Service System for registrants in the age groups that would be drafted first were already outdated, and up to 75% for those registrants in their last year of potential eligibility to be drafted would be invalid.
Document 9: Conscription in the United States: Conscription in the United States, commonly known as the draft, has been employed by the federal government of the United States in four conflicts: the American Civil War, World War I, World War II, and the Cold War (including both the Korean and Vietnam Wars). The third incarnation of the draft came into being in 1940 through the Selective Training and Service Act. It was the country's first peacetime draft. From 1940 until 1973, during both peacetime and periods of conflict, men were drafted to fill vacancies in the United States Armed Forces that could not be filled through voluntary means. The draft was ended when the United States Armed Forces moved to an all-volunteer military force. However, the Selective Service System remains in place as a contingency plan; all male civilians between the ages of 18 and 25 are required to register so that a draft can be readily resumed if needed.
Document 10: Conscription in Turkey: In Turkey, compulsory military service applies to all male citizens from twenty to forty-one years of age. Those who are engaged in higher education or vocational training programs prior to their military drafting are allowed to delay service until they have completed the programs or reach a certain age. The duration of the basic military service varies: for those without 4-year university degrees twelve months as privates; for those with 4-year university degrees or higher either twelve months as reserve officers or six months as short-term privates.
Document 11: President Lincoln's 75,000 volunteers: On April 15, 1861, at the start of the American Civil War, the President of the United States, Abraham Lincoln, called for a 75,000-man militia to serve for three months following the bombardment and surrender of Fort Sumter. Some slave states refused to send troops against their neighboring slave states, with the result that most such states also declared secession from the United States and joined the Confederate States.
Document 12: Enrollment Act: The Enrollment Act, 12 Stat. 731 , enacted March 3, 1863, also known as the Civil War Military Draft Act, was a legislation passed by the United States Congress during the American Civil War to provide fresh manpower for the Union Army. A form of conscription, the controversial act required the enrollment of every male citizen and those immigrants who had filed for citizenship between ages twenty and forty-five. Federal agents established a quota of new troops due from each congressional district. In some cities, particularly New York City, enforcement of the act sparked civil unrest as the war dragged on, leading to the New York City draft riots on July 13–16. It replaced the previous Militia Act of 1862.
Document 13: Conscription in Cyprus: Military service in the Cypriot National Guard is mandatory for all male citizens of the Republic of Cyprus, as well as any male non-citizens born of a parent of Greek Cypriot descent, lasting from the January 1 of the year in which they turn 18 years of age to December 31, of the year in which they turn 50. All male residents of Cyprus who are of military age (16 and over) are required to obtain an exit visa from the Ministry of Defense.
Document 14: Selective Service Act of 1917: The Selective Service Act or Selective Draft Act (Pub.L. 65–12 , 40 Stat. 76 , enacted  18, 1917 ) authorized the federal government to raise a national army for the American entry into World War I through the compulsory enlistment of people. It was envisioned in December 1916 and brought to President Woodrow Wilson's attention shortly after the break in relations with Germany in February 1917. The Act itself was drafted by then-Captain (later Brigadier General) Hugh S. Johnson after the United States entered World War I by declaring war on Germany. The Act was canceled with the end of the war on November, 1918. The Act was upheld by the United States Supreme Court in the "Selective Draft Law Cases" in 1918, a decision based partially on Vattel's "The Law of Nations" of 1758.
Document 15: Thomas E. O'Donnell (judge): Thomas E. (Tom) O'Donnell is a judge of the Irish Circuit Court since 2011. Prior to his appointment, he was a judge of the Irish District Court from 1998.
ground_truth: four