Republicans will hold at least 246 seats in the House come January, matching the post-World War II high of the Truman administration.
Republicans will expand their current 234-201 advantage by a dozen seats in the next Congress — with one race still undecided.
On Saturday, Republicans kept control of two Louisiana seats by winning runoffs.
The House breakdown next year will be 246-188, but could grow.
There's still an automatic recount in a Democratic-held district in the Tucson, Arizona-area. Rep. Ron Barber trails Republican challenger Martha McSally by fewer than 200 voters.
If McSally wins, Republicans would have 247 seats, the largest majority since 1929-31 when the GOP controlled 270 seats in President Herbert Hoover's administration.
Republicans will run the Senate, too.
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