Pilihan raya separuh penggal Amerika Syarikat 2018

Sebuah pilihan raya separuh penggal telah diadakan di Amerika Syarikat pada hari Selasa tanggal 6 November 2018, di tengah-tengah penggal Presiden Donald Trump dari Parti Republikan. Sebanyak 35 daripada 100 kerusi dalam Senat dan semua 435 kerusi dalam Dewan Perwakilan negara ini telah dipertandingkan, termasuk 39 pilihan raya gabenor negeri dan wilayah. Parti Demokrat berjaya merampas kuasa dalam Dewan Perwakilan serta meraih pertambahan kerusi secara peringkat negeri sementara Parti Republikan diluaskan majoriti dalam  Senat.

 Jadual keputusan peringkat negeri, wilayah dan persekutuan 
Subdivision and PVISebelum pilihan raya 2018After 2018 electionsSubdivisionPVIGovernorState leg.SenatDewan PerwakilanGovernorState leg.U.S. SenateU.S. HouseAlabamaR+14RepRepSplitRep 6–1RepRepSplitRep 6–1AlaskaR+9IndSplitRepRep 1–0RepRepRepRep 1–0ArizonaR+5RepRepRepRep 5–4RepRepSplitDem 5–4ArkansasR+15RepRepRepRep 4–0RepRepRepRep 4–0CaliforniaD+12DemDemDemDem 39–14DemDemDemDem 46–7ColoradoD+1DemSplitSplitRep 4–3DemDemSplitDem 4–3ConnecticutD+6DemSplitDemDem 5–0DemDemDemDem 5–0DelawareD+6DemDemDemDem 1–0DemDemDemDem 1–0FloridaR+2RepRepSplitRep 15–11RepRepRepRep 14–13GeorgiaR+5RepRepRepRep 10–4RepRepRepRep 9–5HawaiiD+18DemDemDemDem 2–0DemDemDemDem 2–0IdahoR+19RepRepRepRep 2–0RepRepRepRep 2–0IllinoisD+7RepDemDemDem 11–7DemDemDemDem 13–5IndianaR+9RepRepSplitRep 7–2RepRepRepRep 7–2IowaR+3RepRepRepRep 3–1RepRepRepDem 3–1KansasR+13RepRepRepRep 4–0DemRepRepRep 3–1KentuckyR+15RepRepRepRep 5–1RepRepRepRep 5–1LouisianaR+11DemRepRepRep 5–1DemRepRepRep 5–1MaineD+3RepSplitSplit R/ISplit 1–1DemDemSplit R/IDem 2–0MarylandD+12RepDemDemDem 7–1RepDemDemDem 7–1MassachusettsD+12RepDemDemDem 9–0RepDemDemDem 9–0MichiganD+1RepRepDemRep 9–4DemRepDemSplit 7–7MinnesotaD+1DemRepDemDem 5–3DemSplitDemDem 5–3MississippiR+9RepRepRepRep 3–1RepRepRepRep 3–1MissouriR+9RepRepSplitRep 6–2RepRepRepRep 6–2MontanaR+11DemRepSplitRep 1–0DemRepSplitRep 1–0NebraskaR+14RepNPRepRep 3–0RepNPRepRep 3–0NevadaD+1RepDemSplitDem 3–1DemDemDemDem 3–1New HampshireEvenRepRepDemDem 2–0RepDemDemDem 2–0New JerseyD+7DemDemDemDem 7–5DemDemDemDem 11–1New MexicoD+3RepDemDemDem 2–1DemDemDemDem 3–0New YorkD+11DemSplitDemDem 17–9DemDemDemDem 21–6North CarolinaR+3DemRepRepRep 10–3DemRepRepRep 9–3North DakotaR+17RepRepSplitRep 1–0RepRepRepRep 1–0OhioR+3RepRepSplitRep 12–4RepRepSplitRep 12–4OklahomaR+20RepRepRepRep 4–0RepRepRepRep 4–1OregonD+5DemDemDemDem 4–1DemDemDemDem 4–1PennsylvaniaEvenDemRepSplitRep 10–6DemRepSplitSplit 9–9Rhode IslandD+10DemDemDemDem 2–0DemDemDemDem 2–0South CarolinaR+8RepRepRepRep 6–1RepRepRepRep 5–2South DakotaR+14RepRepRepRep 1–0RepRepRepRep 1–0TennesseeR+14RepRepRepRep 7–2RepRepRepRep 7–2TexasR+8RepRepRepRep 25–11RepRepRepRep 23–13UtahR+20RepRepRepRep 4–0RepRepRepRep 3–1VermontD+15RepDemSplit D/IDem 1–0RepDemSplit D/IDem 1–0VirginiaD+1DemRepDemRep 7–4DemRepDemDem 7–4WashingtonD+7DemDemDemDem 6–4DemDemDemDem 7–3West VirginiaR+20RepRepSplitRep 2–0RepRepSplitRep 3–0WisconsinEvenRepRepSplitRep 5–3DemRepSplitRep 5–3WyomingR+25RepRepRepRep 1–0RepRepRepRep 1–0United StatesEvenRep 33–16–1Rep 31–13Rep 51–49Rep 235–193Rep 27–23Rep 30–18Rep 53–47Dem 235–199Washington, D.C.D+43DemDemrowspan=6 DemDemDemrowspan=6 DemAmerican Samoarowspan=5 NPNPRepNPNPRepGuamRepDemDemDemDemDemN. Mariana IslandsRepRepIndRepRepIndPuerto RicoPNP/DPNPPNP/RPNP/DPNPPNP/RU.S. Virgin IslandsIndDemDemDemDemDemSubdivisionPVIGovernorState leg.U.S. SenateU.S. HouseGovernorState leg.U.S. SenateU.S. HouseSubdivision and PVIBefore 2018 electionsAfter 2018 elections
Kemenangan Parti Demokrat ke atas Dewan Perwakilan membolehkan mereka menghalang pelulusan undang-undang yang bersifat konservatif sewaktu bersidangnya Kongres Amerika Syarikat ke-116 dari Januari 2019 hingga Januari 2021. Parti tersebut juga akan mengawal jawatankuasa kongres Amerika Syarikat dengan kuasa mengeluarkan sepina serta menyiasat berbagai-bagai isu dalam jawatankuasa ini. Walau bagaimanapun, pengekalan pihak Republikan ke atas Senat membolehkan mereka mengesahkan pencalonan para pegawai pilihan Presiden Trump tanpa perlunya sokongan parti lawan itu.

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