Question: In which state was Emperor Maximilian I of Mexico executed on 19 June 1867?

Context paragraphs:
Triumphal Procession: The Triumphal Procession (in German, "Triumphzug") or Triumphs of Maximilian is a monumental 16th-century series of woodcut prints by several artists, commissioned by the Holy Roman Emperor Maximilian I.  The composite image was printed from over 130 separate wood blocks; a total of 139 are known.  Approximately 54 m long, it is one of the largest prints ever produced.  It was designed to be pasted to the walls in city halls or the palaces of princes to create a decorative frieze, an expression of the Emperor's power and magnificence: a pictorial form of the contemporaneous royal entry, which like many Renaissance entries looked back to the Roman triumph.  Maximilian's papers show that he intended the procession to "grace the walls of council chambers and great halls of the empire, proclaiming for posterity the noble aims of their erstwhile ruler".  It was one of several works of propaganda in literary and print form commissioned by Maximilian, who was always drastically short of money, and lacked the funds to actually stage such a ceremony, unlike his Habsburg descendants.  It could also be bound as a book, and it is copies treated this way which have survived, as well as those from later reprints.

Portrait of Emperor Maximilian I: The Portrait of Emperor Maximilian I is an oil painting by Albrecht Dürer, dating to 1519 and now at the Kunsthistorisches Museum of Vienna, Austria.  It portrays the emperor Maximilian I.

Agustín de Iturbide y Green: Don Agustín de Iturbide y Green, Prince of Iturbide (2 April 1863, in Mexico City, Mexico – 3 March 1925, in Washington, D.C.) was the grandson of Agustín de Iturbide, the first emperor of independent Mexico, and his consort Empress Ana María.  He became the adopted son, along with his cousin Salvador de Itúrbide y de Marzán, of Mexico's only other royal heads of state—Emperor Maximilian I of Mexico and Empress Carlota of Mexico.  After the death of Emperor Maximilian in 1867, he became the Head of the Imperial House of Mexico, but he had no children.  His claims passed to Maria Josepha Sophia de Iturbide, the daughter of his cousin, Salvador.

Maximilian I of Mexico: Maximilian (Spanish: "Maximiliano"; born "Ferdinand Maximilian Joseph"; 6 July 1832 – 19 June 1867) was the only monarch of the Second Mexican Empire.  He was a younger brother of the Austrian emperor Francis Joseph I.  After a distinguished career in the Austrian Navy, he accepted an offer by Napoleon III of France to rule Mexico.  France (along with the United Kingdom and Spain, who both withdrew the following year after negotiating agreements with Mexico's democratic government) had invaded Mexico in the winter of 1861, as part of the War of the French Intervention.  Seeking to legitimize French rule in the Americas, Napoleon III invited Maximilian to establish a new Mexican monarchy for him.  With the support of the French army, and a group of conservative Mexican monarchists hostile to the liberal administration of new Mexican President Benito Juárez, Maximilian traveled to Mexico.  Once there, he declared himself Emperor of Mexico on 10 April 1864.

Querétaro City: Querétaro City is the capital and largest city of the state of Querétaro, located in central Mexico.  It is part of the macroregion of Bajío.  It is located 213 km northwest of Mexico City, 63 km southeast of San Miguel de Allende and 200 km south of San Luis Potosí.  The city of Querétaro is divided into seven boroughs: Josefa Vergara y Hernández, Felipe Carrillo Puerto, Centro Histórico, Cayetano Rubio, Santa Rosa Jáuregui, Félix Osores Sotomayor and Epigmenio González.  In 1996, the historic center of Querétaro was declared a World Heritage Site by UNESCO.

The Execution of Emperor Maximilian: The Execution of Emperor Maximilian is a series of paintings by Édouard Manet from 1867 to 1869, depicting the execution by firing squad of Emperor Maximilian I of the short-lived Second Mexican Empire.  Manet produced three large oil paintings, a smaller oil sketch and a lithograph of the same subject.  All five works were brought together for an exhibition in London and Mannheim in 1992–93, and at the Museum of Modern Art in New York in 2006.

Emperor Maximilian Memorial Chapel: The Emperor Maximilian Memorial Chapel is located on the "Cerro de las Campanas" (Hill of Bells) in Querétaro City.  It is located on the spot where Emperor Maximilian I of Mexico was executed 19 June 1867, and dedicated to his memory.

Charles de Lorencez: Charles Ferdinand Latrille, Comte de Lorencez (23 May 1814 –16 July 1892) was a French Army general under Emperor Maximilian of Mexico during the 19th century.  He was a relative of the Empress Charlotte, who was the only daughter of King Leopold I, King of the Belgians and wife of Emperor Maximilian.

Santiago Vidaurri: José Santiago Vidaurri Valdez (1809–1867) was a controversial and powerful governor of the Mexican states of Nuevo León and Coahuila between 1855 and 1864.  He was an advocate of states' rights.  In 1861, he sought an association with the Confederate States of America, which benefited his region economically.  Earlier in 1855, he had been a supporter of the Revolution of Ayutla, which brought liberals to power.  Vidaurri supported Benito Juarez in the War of the Reform.  He later broke with Juarez and supported Emperor Maximilian I of Mexico.  When the French regime fell in 1867, Vidaurri was captured and executed for his alliance with the French.  In Nuevo León he remains an important historical figure.

José Luis Blasio: José Luis Blasio y Prieto (1842–1923, Mexico City) was private secretary to Emperor Maximilian I of Mexico from 1865 to 1867.  He published the book "Maximiliano Íntimo" (Intimate Maximilian) in 1905, based on his experiences during his service to the second Emperor of Mexico.

Supporting paragraphs: Emperor Maximilian Memorial Chapel Querétaro City
Answer: Querétaro