because vs insofar as

because

conj
  • As is known, inferred, or determined from the fact that. 

  • By or for the cause that; on this account that; for the reason that. 

adv
  • On account (of), for sake (of). 

  • Used alone to refuse to provide a full answer a question begun with "why", usually taken as an anapodoton of the elided full phrase "Because I said so". 

prep
  • On account of, because of. 

insofar as

conj
  • to the extent that 

How often have the words because and insofar as occurred in a corpus of books? (source: Google Ngram Viewer )