The US Federal Reserve Board published a FEDS Notes research article that traces how the Federal Reserve’s balance sheet has changed in size and composition from 1914 through end-2025, putting the post-2008 expansion and the recent adjustment toward an “ample” reserves framework into longer-run context. The note centres on a chart showing major asset and liability components as a share of GDP at each year-end, drawing on a historical weekly balance sheet dataset and subsequent H.4.1 releases. It highlights key inflection points including the waning role of gold after the end of Bretton Woods, the shift to publicly announced federal funds rate targeting under a “scarce reserves” regime in the early 1990s, and the breakdown of that regime in 2008 when lending and central bank liquidity swaps expanded beyond available Treasury holdings. Quantitatively, the balance sheet is shown peaking at about 22 percent of GDP during the Great Depression and World War II, reaching just over 25 percent of GDP in 2014 after crisis-era asset purchases, declining to a bit under 20 percent of GDP by 2019, and standing at about 22 percent of GDP at end-2025 following pandemic-era actions and subsequent balance sheet shrinkage.