Question: In 1900, what was the population of the second largest city, in the state that the cross-border transactions committee focuses on?

Passages:
In 2005, Peterson was appointed to the cross-border transactions committee of the Arizona Department of Real Estate. The committee is focused on international real estate transactions between residents of Arizona and Mexico. In the same year, he was appointed as the chairman of the Technology Subcommittee of the 2006 Executive Bond Committee, by Phoenix Mayor Phil Gordon. The $850 million bond initiative was approved by voters in March 2006. He also financially supported the March 25, 2006, and April 10, 2006, reform marches organized by immigrants and he was a co-host at a June 1, 2006, fundraiser for Arizona Senatorial candidate Jim Pederson, featuring former president, Bill Clinton. Jeffrey held a fundraiser at his residence for Barack Obama featuring Democratic National Committee Chairman Howard Dean and actress Scarlett Johansson on August 21, 2008. Peterson was named as a co-host at an October 19, 2016 fundraising event for Democratic candidate Hillary Clinton featuring Chelsea Clinton at a private residence in Phoenix.In 2013, Peterson was appointed to the Board of Directors of the U.S. Philippines Society, a Washington, D.C. based private sector initiative chaired by U.S. Ambassador John Negroponte and former AIG Chairman Maurice "Hank" Greenberg. A prominent picture of Peterson with Benigno Aquino III, former President of the Philippines, was set at the Malacañang Palace and featured in a 2017 print publication.According to Maricopa County's property records, Peterson owned a residence in the same condominium as Arizona Senator John McCain. Tucson is located 118 mi (190 km) southeast of Phoenix and 60 mi (97 km) north of the United States - Mexico border. The 2010 United States Census puts the city's population at 520,116 with a metropolitan area population at 980,263. In 2009, Tucson ranked as the 32nd largest city and 52nd largest metropolitan area in the United States. A major city in the Arizona Sun Corridor, Tucson is the largest city in southern Arizona, the second largest in the state after Phoenix. It is also the largest city in the area of the Gadsden Purchase. As of 2015, The Greater Tucson Metro area has exceeded a population of 1 million. By 1900, 7,531 people lived in the city. The population increased gradually to 13,913 in 1910. At about this time, the U.S. Veterans Administration had begun construction on the present Veterans Hospital. Many veterans who had been gassed in World War I and were in need of respiratory therapy began coming to Tucson after the war, due to the clean dry air. Over the following years the city continued to grow, with the population increasing to 20,292 in 1920 and 36,818 in 1940. In 2006 the population of Pima County, in which Tucson is located, passed one million while the City of Tucson's population was 535,000.

Supporting sentences:
In 2005, Peterson was appointed to the cross-border transactions committee of the Arizona Department of Real Estate. Tucson is located 118 mi (190 km) southeast of Phoenix and 60 mi (97 km) north of the United States - Mexico border. By 1900, 7,531 people lived in the city.