Democrats have won full control of government in at least six states in the US midterm elections, a state-level sweep that gives the party new power over healthcare, abortion, education and voting rules in some of the country's most closely fought battlegrounds.

The Associated Press reported that Democrats secured the governorship and majorities in both legislative chambers in Arizona, Michigan, Minnesota, Pennsylvania, Nevada and Wisconsin, where Republicans previously shared power. The party will hold at least 28 governorships, with results still pending in Alaska and Kansas.

The most striking result came in Arizona, where Democrats won both chambers of the legislature and retained the governor's office, giving the party its first trifecta in the state since 1966. The AP called enough legislative races on Friday to confirm both chambers had flipped. Republicans had controlled the Arizona House for 60 years and the Senate since the early 1990s.

A decade of firsts in one night

Governor Katie Hobbs won re-election, defeating Republican Andy Biggs, while Democrats Kris Mayes and Adrian Fontes were re-elected as attorney general and secretary of state. If results hold, Democrats are on track for a 20-10 supermajority in the state Senate and a 37-23 advantage in the House.

Elsewhere, Pennsylvania Democrats flipped the state Senate to complete a trifecta for the first time since the early 1990s, and Texas Democrats captured the House and the governor's office, electing Gina Hinojosa as the state's first Democratic governor since 1994, although Republicans kept the Texas Senate.

Democrats also flipped at least 500 legislative seats nationwide and gained majorities in at least 12 chambers, according to the Democratic Legislative Campaign Committee. The AP said further counting could still add to the number of states changing hands.