The $3.1bn acquisition is part of a broader expansion by the Italian chocolate company.
The US health secretary on Tuesday announced the country would ban eight commonly used artificial food dyes, some found in breakfast cereals.
It follows the closure of a sister site in Greater Manchester, with the loss of 360 jobs.
The cereal brand asks customers to throw boxes away after "hard lumps" are found in some.
The company says the age and size of the plant means it "has no future".
Parent company Kellanova has plans to shut its Trafford Park factory, which was built in 1938.
Kellanova, which owns the brand, outlines plans to shut its 1938 Trafford Park factory.
The food company is to offer workers who suffer domestic abuse 10 days of extra paid leave.
The trio celebrated the impact of footballer and anti-poverty campaigner Marcus Rashford on a visit to Manchester.
