The Grand Army of the Republic (GAR) emerged as a significant organization in post-Civil War America, founded by a small group of Union veterans in Decatur, Illinois. It began as a social club for former soldiers, aiming to foster camaraderie among those who had served in the Union Army. The founders, including Major General John A. Logan, intended the GAR to be a vehicle for veterans' advocacy and social interaction, addressing the needs and rights of their members after the war. As its ranks grew, so did its influence, expanding from local chapters to a national organization dedicated to veterans’ affairs.

The GAR provided a means for veterans to advocate for pensions, benefits, and recognition for their sacrifices during the Civil War. Members organized annual encampments, drawing thousands of participants to celebrate their service and reflect on the war's legacy. The GAR not only instilled pride in its members but also used its collective voice to influence legislation, helping to shape policies related to veteran services and memorializing the fallen. By promoting the adoption of Memorial Day as a national holiday, the GAR played a critical role in ensuring that sacrifices made during the Civil War were not forgotten.

Throughout its existence, the GAR adapted to the changing landscape of American society, eventually expanding its focus to include issues related to social justice and veterans’ rehabilitation. By the time of its dissolution in 1956, the GAR had made significant contributions to veterans’ rights and American political fabric. Their efforts not only highlighted the importance of remembering Civil War veterans but also set the stage for future veterans' organizations, paving the way for continued advocacy for the rights and benefits of all military veterans.