1990 June 27 – U.S. President George H.W. Bush issues a proclamation creating Petroglyph National Monument.
1965 June 28 – The Pecos National Monument is established when U.S. President Lyndon B. Johnson issues a proclamation under the Antiquities Act.
1954 June 28 – Fort Union National Monument is established when U.S. President Dwight D. Eisenhower issues a proclamation under the Antiquities Act.
1924 June 2 – The Indian Citizenship Act of 1924 is signed by U.S. President Calvin Coolidge granting full United States Citizenship to all Native Americans born in the United States. There continued to be struggles for years to come.
1910 June 20 – The Enabling Act is signed by U.S. President William Howard Taft, which entitled the people of New Mexico and Arizona to form a state constitution and be admitted into the Union on an equal footing with the original States.
1908 June 26 – The Carson National Forest is established by U.S. President Theodore Roosevelt.
1908 June 18 – The Datil National Forest is established by U.S. President Theodore Roosevelt. The Datil National Forest has since been incorporated under the jurisdiction of the Cibola National Forest and the Gila National Forest.
1906 June 16 – An Enabling Act is signed by U.S. President Theodore Roosevelt, which would have enabled the people of Oklahoma, New Mexico and Arizona to form state constitutions and be admitted into the Union. New Mexico and Arizona, however, would be not gain entrance into the Union until 1912.
1906 June 8 – The American Antiquities Act is signed by U.S. President Theodore Roosevelt, which enables the President to create national monuments on federal lands to protect significant natural, cultural, or scientific features. The Antiquities Act has played a large role in the preservation of important sites throughout New Mexico, such as the White Sands National Park and the most recent creation Organ Mountains-Desert Peaks National Monument.
1897 June 2 – Miguel Antonio Otero II, after whom Otero County is named, is appointed the fifteenth Governor of the Territory of New Mexico by U.S. President William McKinley. His father, Miguel Antonio Otero I, was also a politician during the mid 1800s but differed from his son on the issue of slavery.
1862 June 19 – President U.S. President Abraham Lincoln frees all Persons within the Territories of the United States, including the Territory of New Mexico.
1854 June 8 – The Treaty of Mesilla, also known as the Gadsden Purchase goes into effect creating the current United States-Mexico border. resolving the conflicts surrounding the land south of the Gila River and resolving Mexican complaints regarding raids by the Native Americans.
1850 June 20 – In a failed attempt to organize a slave State of New Mexico, a state constitution is adopted by a vote of 6,771 to 39 and Henry Connelly is elected governor. Provisional Governor John Munroe refuses to let those elected take office without the express approval of the United States Congress.
1812 June 4 – The Territory of Missouri is created by U.S. President James Madison. Missouri would later play a significant impact on New Mexico’s early Territorial Days as much of the Kearney Code is derived from Missouri law when the author Missouri attorney and Colonel Alexander Doniphan based it on the Missouri Constitution.
1646 June 18 – Capitán Don Luis de Guzmán y Figueroa is appointed Gobernador de Nuevo Méjico. During his tenure, he was bribed by the previous Gobernador and resigned the office in controversy.