May 7. 1518: Juan de Grijalva's expedition, sailing the Yucatan coast, reports the Mayan city of Tulum is larger and as grand as Seville. 1984: American veterans of the Vietnam War reached an out-of-court settlement with seven chemical companies in their class-action suit relating to use of herbicide "Agent Orange."

May 8. 1863: International Red Cross founded. 1876: Peter Maurin, co-founder of Catholic Worker movement, born.

May 9. 1921: Radical priest and anti-war activist Daniel Berrigan is born. 1970: Five days after the Kent State killings, 100,000 march in Washington, C, against Vietnam War.

May 10. 1967: Capt. Howard Levy jailed 3 years for refusing to train US soldiers for Vietnam. 1984: Federal judge in Salt Lake City, Utah held that the US government had been negligent in its above-ground testing of nuclear weapons in Nevada from 1951 to 1962.

May 11. 1968: The 3 biggest French labor federations call a General Strike to support student protests. 1975: 80,000 turn out in New York's Central Park to celebrate the end of the Vietnam War.

May 12. 1847: Freedom fighter Tiburcio Vasquez fights Anglo invaders in California.

May 13. 1992: Ecuador's government grants 148 native communities legal title to more than 3 million acres (slightly less than the size of the state of Washington) in the Amazon Basin.

May 14. 1945: Plutonium is injected intravenously into a human subject in an experiment carried out by the Los Alamos scientific laboratory. In all, 18 people were similarly tested between 1945 and 1946. 1970: 2 students watching from a nearby dormitory tower are shot and killed by state police, 30 others are wounded at anti-war demonstration at the primarily African-American Jackson State University, Mississippi.

May 15. 1970: In response to invasion of Cambodia and killings at Kent State and Jackson State, several million US students hold campus strikes.

May 16. 1791: Denmark becomes first Western country to outlaw slave trade. 1961: Military coup deposes South Korean Prime Minister John Chang.

May 17. 1968: "Catonsville Nine," including Phil and Dan Berrigan, break into Catonsville, Maryland draft board center and burn over 600 draft files. 1970: 100 protesters stage a "die-in" in downtown Seattle to protest shipment through Seattle of Army nerve gas being transported from Okinawa to the Umatilla Army Depot in eastern Oregon. Umatilla still contains massive stocks of chemical weapons.

May 18. 1958: In the face of Pres. Eisenhower's denials that the US is aiding anti-Sukarno rebels in Indonesia, an American B-26 was shot down by Indonesia while bombing Sumatra. The pilot was eventually unmasked as a CIA employee. The US-backed coup in 1964 which unseated Sukarno, replacing him with Suharto, was one of the bloodiest massacres in the 20th century.

May 19. 1921: Congress sharply curtails immigration to the US, setting up a national quota system. 1934: 10,000 participate in a "No More War" march in New York City.

May 20. 1776: Mohawks, under Joseph Brandt, defeat Americans at the Battle of the Cedars. 1974: England: Pat Arrowsmith jailed for 1-1/2 years for leafleting soldiers about Northern Ireland.