1889: The Oklahoma land rush begins

At precisely high noon, thousands of would-be settlers make a mad dash into the newly opened Oklahoma Territory to claim cheap land.

The nearly two million acres of land opened up to white settlement was located in Indian Territory, a large area that once encompassed much of modern-day Oklahoma. Initially considered unsuitable for white colonization, Indian Territory was thought to be an ideal place to relocate Native Americans who were removed from their traditional lands to make way for white settlement. The relocations began in 1817, and by the 1880s, Indian Territory was a new home to a variety of tribes, including the Chickasaw, Choctaw, Cherokee, Creek, Cheyenne, Commanche, and Apache.

By the 1890s, improved agricultural and ranching techniques led some white Americans to realize that the Indian Territory land could be valuable, and they pressured the U.S. government to allow white settlement in the region. In 1889, President Benjamin Harrison agreed, making the first of a long series of authorizations that eventually removed most of Indian Territory from Indian control.

To begin the process of white settlement, Harrison chose to open a 1.9 million-acre section of Indian Territory that the government had never assigned to any specific tribe. However, subsequent openings of sections that were designated to specific tribes were achieved primarily through the Dawes Severalty Act (1887), which allowed whites to settle large swaths of land that had previously been designated to specific Indian tribes.

On March 3, 1889, Harrison announced the government would open the 1.9 million-acre tract of Indian Territory for settlement precisely at noon on April 22. Anyone could join the race for the land, but no one was supposed to jump the gun. With only seven weeks to prepare, land-hungry Americans quickly began to gather around the borders of the irregular rectangle of territory. Referred to as "Boomers," by the appointed day more than 50,000 hopefuls were living in tent cities on all four sides of the territory.

The events that day at Fort Reno on the western border were typical. At 11:50 a.m., soldiers called for everyone to form a line. When the hands of the clock reached noon, the cannon of the fort boomed, and the soldiers signaled the settlers to start. With the crack of hundreds of whips, thousands of Boomers streamed into the territory in wagons, on horseback, and on foot. All told, from 50,000 to 60,000 settlers entered the territory that day. By nightfall, they had staked thousands of claims either on town lots or quarter section farm plots. Towns like Norman, Oklahoma City, Kingfisher, and Guthrie sprang into being almost overnight.

An extraordinary display of both the pioneer spirit and the American lust for land, the first Oklahoma land rush was also plagued by greed and fraud. Cases involving "Sooners"--people who had entered the territory before the legal date and time--overloaded courts for years to come. The government attempted to operate subsequent runs with more controls, eventually adopting a lottery system to designate claims. By 1905, white Americans owned most of the land in Indian Territory. Two years later, the area once known as Indian Territory entered the Union as a part of the new state of Oklahoma.

More on the old west

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1915: GERMANS INTRODUCE POISON GAS:

On April 22, 1915, German forces shock Allied soldiers along the western front by firing more than 150 tons of lethal chlorine gas against two French colonial divisions at Ypres, Belgium. This was the first major gas attack by the Germans, and it devastated the Allied line.

Toxic smoke has been used occasionally in warfare since ancient times, and in 1912 the French used small amounts of tear gas in police operations. At the outbreak of World War I, the Germans began actively to develop chemical weapons. In October 1914, the Germans placed some small tear-gas canisters in shells that were fired at Neuve Chapelle, France, but Allied troops were not exposed. In January 1915, the Germans fired shells loaded with xylyl bromide, a more lethal gas, at Russian troops at Bolimov on the eastern front. Because of the wintry cold, most of the gas froze, but the Russians nonetheless reported more than 1,000 killed as a result of the new weapon.

On April 22, 1915, the Germans launched their first and only offensive of the year. Known as the Second Battle of Ypres, the offensive began with the usual artillery bombardment of the enemy's line. When the shelling died down, the Allied defenders waited for the first wave of German attack troops but instead were thrown into panic when chlorine gas wafted across no-man's land and down into their trenches. The Germans targeted four miles of the front with the wind-blown poison gas and decimated two divisions of French and Algerian colonial troops. The Allied line was breached, but the Germans, perhaps as shocked as the Allies by the devastating effects of the poison gas, failed to take full advantage, and the Allies held most of their positions.

A second gas attack, against a Canadian division, on April 24, pushed the Allies further back, and by May they had retreated to the town of Ypres. The Second Battle of Ypres ended on May 25, with insignificant gains for the Germans. The introduction of poison gas, however, would have great significance in World War I.

Immediately after the German gas attack at Ypres, France and Britain began developing their own chemical weapons and gas masks. With the Germans taking the lead, an extensive number of projectiles filled with deadly substances polluted the trenches of World War I. Mustard gas, introduced by the Germans in 1917, blistered the skin, eyes, and lungs, and killed thousands. Military strategists defended the use of poison gas by saying it reduced the enemy's ability to respond and thus saved lives in offensives. In reality, defenses against poison gas usually kept pace with offensive developments, and both sides employed sophisticated gas masks and protective clothing that essentially negated the strategic importance of chemical weapons.

The United States, which entered World War I in 1917, also developed and used chemical weapons. Future president Harry S. Truman was the captain of a U.S. field artillery unit that fired poison gas against the Germans in 1918. In all, more than 100,000 tons of chemical weapons agents were used in World War I, some 500,000 troops were injured, and almost 30,000 died, including 2,000 Americans.

In the years following World War I, Britain, France, and Spain used chemical weapons in various colonial struggles, despite mounting international criticism of chemical warfare. In 1925, the Geneva Protocol of 1925 banned the use of chemical weapons in war but did not outlaw their development or stockpiling. Most major powers built up substantial chemical weapons reserves. In the 1930s, Italy employed chemical weapons against Ethiopia, and Japan used them against China. In World War II, chemical warfare did not occur, primarily because all the major belligerents possessed both chemical weapons and the defenses--such as gas masks, protective clothing, and detectors--that rendered them ineffectual. In addition, in a war characterized by lightning-fast military movement, strategists opposed the use of anything that would delay operations. Germany, however, did use poison gas to murder millions in its extermination camps.

Since World War II, chemical weapons have only been used in a handful of conflicts--the Yemeni conflict of 1966-67, the Iran-Iraq War of 1980-88--and always against forces that lacked gas masks or other simple defenses. In 1990, the United States and the Soviet Union signed an agreement to cut their chemical weapons arsenals by 80 percent in an effort to discourage smaller nations from stockpiling the weapons. In 1993, an international treaty was signed banning the production, stockpiling (after 2007), and use of chemical weapons. It took effect in 1997 and has been ratified by 128 nations.

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1970 The first Earth Day
Earth Day was the creation of Senator Gaylord Nelson  of Wisconsin, a staunch environmentalist who hoped to provide unity to the grassroots environmental movement and increase ecological awareness. "The objective was to get a nationwide demonstration of concern for the environment so large that it would shake the political establishment out of its lethargy," Senator Nelson said, "and, finally, force this issue permanently onto the national political agenda. As he described it, a number of senators were concerned about the state of the country's environment in the early 1960s. 

In a move intended to bring national visibility to the issue of environmental deterioration, the senators persuaded President John F. Kennedy to take on a nationwide conservation tour, "spelling out in dramatic language the serious and deteriorating condition of our environment." The tour was a failure. Senators Hubert Humphrey, Gene McCarthy, Joe Clark, and Nelson himself accompanied Kennedy on the first leg of his trip to Pennsylvania, Minnesota, and Wisconsin. Though the tour failed to rouse interest of any significant level in the environment as a political issue, Nelson credits the mission with being the seed from which Earth Day would eventually flower. 

The idea for a grassroots effort gestated in Nelson's head until July of 1969, when, according to Nelson, the anti-war teach-ins of the Vietnam Era inspired him to conceive of a nationwide environmental "teach-in." Nelson returned to Washington and began to raise funds for the event. In addition, he and his staff sent letters to fifty governors, and to the mayors of major cities, requesting them to make Earth Day Proclamations. In a speech in Seattle in September of 1969, Nelson formally announced that a nationwide environmental teach-in would take place in the spring of the coming year. All of the major wire services ran the story, and the response was dramatic.

 From that point on, says Nelson, Earth Day was the product of the populace. By December, the number of inquiries had so overwhelmed Nelson's Senate office that an Earth Day Clearing House was set up in Washington to plan for the event. In the end, an estimated twenty million people participated in Earth Day events of some kind. Ten thousand grade schools and high schools, two thousand colleges, and one thousand communities across the country held official events. Earth Day is responsible for establishing the efficacy of grassroots environmental advocacy. A by-product of Earth Day that directly effected the automobile industry was the public's heightened awareness of the environmental dangers of gasoline exhaust emissions.

On April 22, 1990, the 20th anniversary of Earth Day, more than 200 million people in 141 countries participated in Earth Day celebrations.