Question: What year was the Governor of Oklahoma first elected who approved the Oklahoma Housing Finance Agency's first trust indenture?

Context paragraphs:
Federal Housing Finance Agency: The Federal Housing Finance Agency (FHFA) is an independent federal agency created as the successor regulatory agency of the Federal Housing Finance Board (FHFB), the Office of Federal Housing Enterprise Oversight (OFHEO), and the U.S. Department of Housing and Urban Development government-sponsored enterprise mission team, absorbing the powers and regulatory authority of both entities, with expanded legal and regulatory authority, including the ability to place government sponsored enterprises (GSEs) into receivership or conservatorship.

Oregon Housing and Community Services Department: The Oregon Housing and Community Services Department (OHCS) is the housing finance agency of the government of the U.S. state of Oregon.  It administers programs providing financing assistance for single family homes, new construction or rehabilitation of multi-family affordable housing developments, and grants and tax credits to promote affordable housing.  Prior to 1991, when the Oregon Legislative Assembly merged the Housing Agency with State Community Services forming OHCS to eliminate duplicative costs and provide better coordination of related activities, financing and service programs were operated separately.

David L. Boren: David Lyle Boren (born April 21, 1941) is an American university administrator and politician from the state of Oklahoma.  A member of the Democratic Party, he served as the 21st governor of Oklahoma from 1975 to 1979 and in the United States Senate from 1979 to 1994.  He is currently the 13th president of the University of Oklahoma.  He was the longest serving chairman of the Senate Select Committee on Intelligence.  David Boren officially announced his retirement as president of the University of Oklahoma, effective June 30, 2018.

Vermont Housing Finance Agency: The Vermont Housing Finance Agency (VHFA) is chartered as a private non-profit agency to finance and promote affordable housing opportunities for low- and moderate- income Vermonters.  They are located in Burlington, Vermont.

Federal Housing Finance Board: The Federal Housing Finance Board (FHFB) was an independent agency of the United States government established in 1989 in the aftermath of the savings and loan crisis to take over oversight of the Federal Home Loan Banks (FHLBs or FHLBanks) from the Federal Home Loan Bank Board (FHLBB), and was superseded by the Federal Housing Finance Agency (FHFA) in 2008.

Oklahoma Housing Finance Agency: The Oklahoma Housing Finance Agency (OHFA) is a non-profit organization which serves the people of Oklahoma by offering affordable housing resources, including loans and rent assistance.  OHFA was created in 1975 when Governor of Oklahoma David L. Boren approved the agency's first trust indenture.  OHFA is a public trust with the State of Oklahoma as the beneficiary.  The Trust was established to better the housing stock and the housing conditions in the State of Oklahoma and administers the Section 8 housing program for the State.

Nyhomes: Nyhomes is New York State's affordable housing lender.  Its mission is to expand affordable housing opportunities for low- and moderate-income New Yorkers.  “nyhomes” consists of three state agencies: the New York State Housing Finance Agency (HFA), the State of New York Mortgage Agency (SONYMA) and the New York State Affordable Housing Corporation (AHC).

California v. Federal Housing Finance Agency: People of the State of California v. Federal Housing Finance Agency was a California state case in which several California-based plaintiffs filed suit against the Federal Housing Finance Agency (FHFA) for creating a lending rule that impeded the Property Assessed Clean Energy (PACE) program, a program in which property owners repay energy-related property improvements gradually over time (typically 15–20 years) as an addition to their property tax.

Asian Housing Finance Limited: Asian Housing Finance Limited is a company incorporated in Pakistan on March 30, 1994, as a Public Limited Company under the Companies Ordinance, 1984 with the name and style of Inter-fund Housing Finance Limited.  The company obtained certificate for commencement of business on March 30, 1994, from the Ministry of Finance, Government of Pakistan as one of the three specialist private-sector companies carrying out the business of Housing Finance.

Trust Indenture Act of 1939: The Trust Indenture Act of 1939 (TIA), codified at , supplements the Securities Act of 1933 in the case of the distribution of debt securities in the United States.  Generally speaking, the TIA requires the appointment of a suitably independent and qualified trustee to act for the benefit of the holders of the securities, and specifies various substantive provisions for the trust indenture that must be entered into by the issuer and the trustee.  The TIA is administered by the US Securities and Exchange Commission (SEC), which has made various regulations under the act.

Supporting paragraphs: Oklahoma Housing Finance Agency David L. Boren
Answer: 1975