April 30, 1900: Hawaii becomes U.S. territory

In 1896, President McKinley pursued the acquisition of Hawaii as a U.S. territory. In 1897, McKinley agreed to a treaty of annexation with representatives of the Republic of Hawaii. Congress passed the Newlands Resolution, which annexed Hawaii as a U.S. territory. The legality of that resolution continues to be questioned because it is not a treaty of cession or conquest as required by international law.

In 1900, Hawaii was granted self-governance and retained Iolani Palace as the territorial capitol building. Hawaii remained a territory for 60 years. Plantation owners found territorial status convenient, enabling them to import immigrant labor, which was not allowed in most states.

April 29, 1992: Riots break out in Los Angeles when police officers charged with using excessive force in beating of Rodney King are acquitted.

The Los Angeles riots of 1992 began after a jury acquitted four police officers accused in the videotaped beating of black motorist Rodney King. Thousands of people in L.A. rioted for six days after the verdict with widespread looting, assault and arson. Fifty-three people died and hundreds of buildings were destroyed.

In addition to the verdict, other factors were cited as reasons for the unrest, including unemployment among residents of south central L.A., a long-standing perception that the Los Angeles Police Department used excessive force and anger over the sentence given to a Korean-American shop owner for the killing of an African-American girl. The videotaped footage of King being beaten by police officers became a media sensation and a rallying point for activists in L.A.

April 28, 1788: Maryland becomes 7th state to ratify the Constitution

Maryland was one of the 13 original colonies to revolt against British rule in the Revolutionary War. In 1781, Maryland was the 13th state to approve the ratification of the Articles of Confederation, which brought the U.S. into being as a united, sovereign and national state. It 1788, Maryland was the seventh state admitted to the Union after ratifying the Constitution.

April 27, 1950: South Africa passes Group Areas Act, formally segregating races and beginning era of apartheid

The Group Areas Act of 1950 was created by the apartheid government of South Africa and assigned racial groups to different residential and business sections in urban areas. An effect of the law was to prevent nonwhites from living in the most developed areas. The law led to the forced removal of nonwhites from homes located in areas designated for whites. The act was repealed 41 years later on June 5, 1991.

Apartheid was a system of legalized racial segregation enforced by the South African government between 1948 and 1994. Apartheid was dismantled from 1990 to 1993.

April 26, 2001: World Intellectual Property Day established

World Intellectual Property Day, observed annually on April 26, was established in 2001 by the World Intellectual Property Organization to raise awareness of the role of intellectual property and to recognize the contribution that inventors and artists have made to the development of societies. The organization chose April 26 because it was the date on which the convention establishing the World Intellectual Property Organization began in 1970. Observance is intended to promote and expand intellectual property protection, urge countries to publicize intellectual property protection laws, increase public awareness of intellectual property rights and strengthen international exchange in the intellectual property field.