When assimilate is followed by a preposition, transitive senses 2a and 2c commonly take to and into and less frequently with; 2b regularly takes to; sense 3 most often takes to and sometimes with. The most frequent prepositions used with the intransitive sense are to and into.
Examples of ASSIMILATE
Children need to assimilate new ideas.
There was a lot of information to assimilate at school.
Schools were used to assimilate the children of immigrants.
They found it hard to assimilate to American society.
Many of these religious traditions have been assimilated into the culture.
Over time, most of the inhabitants of the “Little Italies” … assimilated rapidly to the society … —Stephan Thernstrom, Times Literary Supplement, 26 May 2000
Those groups were eagerly assimilating into the larger culture and rejecting their own cuisine … —Corby Kummer, New York Times Book Review, 16 Aug. 1998
The mistaken attempts to assimilate Lindner's paintings into the Pop Art movement in the 1960s … —Hilton Kramer, Arts & Antiques, January 1997