Question: At what time was Rivera living in the United States?
About the article "Mexican muralism", section "Influence".

Candidate passages:
Hernandez made his professional boxing debut on June 22, 1969, when he defeated Willie Pastrana (not to be confused with Willie Pastrano the former light heavyweight champion) by a four round decision at Hiram Bithorn Stadium in San Juan.
In his second fight, Hernandez lost for the first time, to another local prospect, Santos Luis Rivera, by a four round decision.
He avenged that loss in his very next bout, beating Rivera by a six round decision in San Juan.
After defeating Jose Rosado, he and Rivera had a rubber match, and this time Rivera won, again, on points over six rounds.
After a four round draw (tie) against Tomas Rivera in Ponce, Hernandez reeled off a streak of eleven wins in a row, three by knockout.
These included a victory over veteran Jose Luis Cetina (59-18-2 coming into their fight) in what was Hernandez's first fight abroad, held at the International Amphitheater, in Chicago, Illinois, United States, when he beat Cetina with a sixth round knockout.
The streak came to an end when he traveled to Panama to fight world-ranked Gilberto Illueca, and dropped a ten round unanimous decision. 
Leonor Rivera and Rizal first met in Manila when Rivera was only 13 years old.
When Rizal left for Europe on May 3, 1882, Rivera was 15 years of age.
Their correspondence began when Rizal left a poem for Rivera saying farewell.
Their letters to each other slowly became romantic.
The correspondence between Rivera and Rizal kept Rizal focused on his studies in Europe.
They employed codes in their letters because Rivera’s mother did not favor Rizal as a suitor for Rivera.
A letter from Mariano Catigbac dated June 27, 1884 referred to Rivera as Rizal’s “betrothed”.
Catigbac described Rivera as having been greatly affected by Rizal’s departure, frequently sick because of insomnia.
When Rizal returned to the Philippines on August 5, 1887, Rivera was no longer living in Manila because she and her family had moved back to Dagupan, Pangasinan.
Rizal wanted to meet Rivera and Rivera also wanted to see Rizal, but both were prohibited by their fathers.
Rizal was forbidden by his father Francisco Mercado in order to avoid putting the Rivera family in danger because at the time Rizal was already labeled by the Spaniards as a "filibustero" or subversive because of the contents of his novel "Noli Me Tangere".
Rizal wanted to marry Rivera while he was still in the Philippines because of Rivera’s uncomplaining fidelity.
Rizal asked permission from his father one more time before his second departure from the Philippines.
The meeting never happened.
In 1888, Rizal stopped receiving letters from Rivera for a year, although Rizal kept sending letters to Rivera.
The reason for Rivera’s year of silence was the connivance between Rivera’s mother and the Englishman named Henry Charles Kipping, a railway engineer who fell in love with Rivera and was favored by Rivera’s mother. 
Rivera was born in San Esteban Catarina, El Salvador, on September 30, 1923.
He was ordained a Priest of the order of Salesians of Don Bosco on September 19, 1953.
"I joined the Salesians", Rivera told the National Catholic Reporter, "because I wanted to work with the poor, and back then they were the ones who weredoing that.
"He was appointed to his first tour as Auxiliary Bishop of San Salvador on July 30, 1960.
At the same time, he was appointed Titular Bishop of Legia.
In light of the social ferment that began in the archdiocese in the 1970s, Rivera supported the controversial pastoral work undertaken by Father Rutilio Grande in the rural outskirts of San Salvador.
According to Jesuit academic Rodolfo Cardenal, Rivera "supported the pastoral and theological innovations" being carried out by the Jesuits.
However, the Church hierarchy apparently disapproved because, when Archbishop Chávez retired in 1977, they overlooked Rivera, Chávez' auxiliary, and selected the more conservative Óscar Romero as Archbishop of San Salvador, to the liberals' dismay.
By that time, Rivera had been tarred as a "red bishop" because of his activism.
In September 1977, Rivera was appointed Bishop of Santiago de María—filling Óscar Romero's old post.
During Romero's stormy tenure as archbishop, Rivera was often Romero's lone ally in the Salvadoran Bishops' Conference, which became divided over Romero's leadership.
The bishops were split between a conservative sector, allegedly aligned to traditional institutions of power in Salvadoran society, and progressive groups influenced by the reformist doctrines of the Second Vatican Council and the Medellín Bishops Conference of 1968.
Msgr.
Rivera attended both influential synods.
After Romero's assassination on March 24, 1980, Rivera was named apostolic administrator of the archdiocese, but not archbishop—in what his friends saw as one more Vatican slight—until February 1983.
Rivera's tenure was a delicate time, during which he sought to avoid Romero's fate, while still denouncing injustices and crimes of war in emphatic terms.
The Church under Rivera played a role as monitor of the peace process alongside the United Nations.
In 1989, Archbishop Rivera presided over one of the darkest moments in the Civil War period, when the Jesuit staff of the Central American University of San Salvador Universidad Centroamericana "José Simeón Cañas" were massacred in assassinations that harkened back to murders at the inception of the war, such as the Romero assassination.
Rivera reportedly told Alfredo Cristiani, the President of El Salvador to post soldiers outside his offices.
"Don't get me wrong", Rivera then told the president.
"It's not that I trust the soldiers.
But if I'm killed, I want it clear who did it.
"The UCA massacre put pressure on the government to end the war and sign a peace deal.
Rivera moderated the negotiations of the final Peace Accords signed between the FMLN and the Salvadoran government in 1992.
In the final years of his ministry, Rivera eagerly instituted a canonization process for his martyred predecessor. 
Rivera served in the United States Army.
From 1952 to 1954, he served during the Korean War.
After being honorably discharged, he was stationed in Germany. 
Evans authored the first English-language book on the famed Mexican painter Diego Rivera.
This illustrated oversize book, "The Frescoes of Diego Rivera", was published in 1929 by Harcourt Brace.
The following year, Rivera was invited to the United States, and in 1931, he was the subject of a retrospective at New York City's Museum of Modern Art.