The phrase "assumed the majority" is correct and usable in written English.
It can be used when discussing a situation where a person or group takes on the role or responsibility of the majority opinion or position in a discussion or decision-making process.
Example: "During the meeting, she assumed the majority view, advocating for the proposal that everyone else seemed to support."
Alternatives: "took on the majority" or "adopted the majority stance".
Party leaders named him their point person in 2006, and when the Democrats assumed the majority in Congress in January 2007, Mr. Obama and Mr. Feingold, a longtime Democratic proponent of ethics reform, proposed curtailing meals and gifts from lobbyists, restricting the use of corporate planes and requiring lobbyists who bundle donations to disclose individual donors.
House Democrats, who assumed the majority last week, passed bills that would reopen shuttered agencies other than DHS, which is at the center of the funding dispute.
For example, I used to go out gay clubbing twice a week whilst at university (the majority of my friends were gay males), and it was very hard for me to find a lady when out because 1) other lesbians most likely assumed I was straight or a "fag hag," and 2) I assumed the majority of pretty ladies in the club were straight or fag hags.
Also, as assumed, the majority of the recruits completed their training.
This assumes the father is in the majority -- an ever declining majority, mind you -- and is circumcised himself.
When Fox assumes the majority stake, it will run the business.
I assume the majority agrees that the Islands' legislature has the power to pass laws on the subject of divorce.
Congressional Democrats have said they would investigate Ms. Trump's practice next year when they assume the majority in the House.
The University does not exist in a vacuum, but neither should it assume the majority position of peer universities that grade inflation is not a problem.
The newly Democratic-controlled House passed the For the People Act, a comprehensive package of reforms that Democrats made the first bill they introduced after assuming the majority.
They also promised that, upon assuming the majority, they would continue the practice of carefully considering all legislation in committee before releasing any bill for a vote.
