The Big Ten has accepted Oregon and Washington for membership starting in 2024, increasing the conference to 18 schools. Andy Nelson/Associated Press

Dealing a combination of crushing blows to the Pac-12, the Big Ten announced Friday it will accept Oregon and Washington as new members next August. Also Friday, the Big 12 announced it is adding Arizona, Arizona State and Utah as members next year, completing its raid of the Pac-12.

The Big Ten earlier in the day cleared the way for the Pacific Northwest rivals to join the league next year, and the Ducks were first to make it official with a brief video call that ended in a unanimous vote by its 13 trustees. The Big Ten a short time later said its presidents’ council had voted to accept the Ducks, along with Washington.

“Our student-athletes will participate at the highest level of collegiate athletic competition, and our alumni, friends and fans will be able to carry the spirit of Oregon across the country,” Oregon President John Karl Scholz said.

The Big 12 has been targeting the Pac-12’s so-called Four Corner state schools for months, with Colorado making the jump last week.

The additions of the Arizona schools and Utah gives the Big 12 16 schools, stretching from Florida to Arizona.

The Pac-12 will soon be down to four members: Stanford, California, Oregon State and Washington State.

The Big Ten’s latest grab from its Rose Bowl partner conference comes a little more than a year after it landed Southern California and UCLA. The moves give the sprawling Big Ten 18 member schools, including four on the West Coast. The Big Ten will be the largest conference in major college sports, spanning 15 states from New Jersey to Washington.

“The Big Ten is a thriving conference with strong athletic and academic traditions, and we are excited and confident about competing at the highest level on a national stage,” Washington President Ana Mari Cauce said.

Former Big Ten Commissioner Kevin Warren had encouraged member schools to consider adding Oregon and Washington after the conference landed the two Los Angeles schools last summer – the blow that has sent the Pac-12 reeling for more than a year.

Pac-12 leaders met early Friday to determine if its remaining schools, which at the time included Oregon and Washington, would accept a media rights deal with Apple that Commissioner George Kilavkoff presented earlier this week, according to a person familiar with that meeting who spoke with The Associated Press on condition of anonymity because the details are private.

Another person familiar with knowledge of the discussion between the Big Ten and Oregon said the Ducks were leaning toward staying in the Pac-12 late Thursday, boosting the possibility that others would follow. Instead, Oregon officials notified the Pac-12 on Friday they were still uncomfortable with the Apple deal and the school would be re-engaging with the Big Ten.

The Pac-12 and Kliavkoff have made no public statements since last week.

Oregon and Washington will receive a reduced payout, Scholz confirmed, compared to current Big Ten members and to USC and UCLA, which are projected to receive more than $60 million each in media rights revenue from the league starting next year. A person familiar with the negotiations said the Ducks and Huskies would receive about $30 million per year, with annual escalators.