From the Introduction: "The United States helped create the Organization of American States (OAS) in 1948 as a multilateral forum in which the nations of the Western Hemisphere could engage one another and address issues of mutual concern. The U.S. Senate gave its advice and consent to ratification of the OAS charter, allowing for U.S. membership in the organization. Congress authorizes and appropriates funding for the OAS, and the executive branch represents and shapes U.S. policy through the State Department and the U.S. Mission to the OAS in Washington, DC. Historically, OAS decisions often have reflected U.S. policy, as other member states have sought to maintain close relations with the dominant economic and political power in the hemisphere. [...] Over the past two decades, however, the United States' ability to shape outcomes in the Western Hemisphere has declined as countries throughout the region have elected ideologically diverse leaders whose domestic and foreign policies have diverged from U.S. policy preferences. [...] Congressional debate regarding the OAS has focused on how to ensure the organization fulfills its mandate to promote democracy, protect human rights, advance economic and social development, and foster security cooperation in the Western Hemisphere. [...] This report briefly discusses the history and governance of the OAS, examines the organization's funding and activities, and raises potential legislative and oversight activities related to the OAS that Congress could consider in the remainder of the 117th Congress or in future years."
CRS Report for Congress, R47230
Congressional Research Service: https://crsreports.congress.gov/