Party control of Congress following the 2026 midterm elections remains the central driver for which measures advance to enactment before year-end. The composition of the House and Senate determines whether appropriations bills, continuing resolutions, or other must-pass legislation can clear both chambers and reach the president without extended negotiations or procedural delays. Key upcoming factors include the lame-duck session timeline, committee assignments, and any administration priorities on taxes, funding, or policy riders that could gain traction in the remaining weeks. Historical patterns show that divided government often narrows the set of enactable bills to essential spending measures, while unified control can expand the agenda before the new Congress convenes in 2027.