In obsolete|lang=en terms the difference between because and therefor
is that
because is (obsolete) so that, in order that while
therefor is (obsolete) therefore, for that or this reason or cause.
As adverbs the difference between because and therefor
is that
because is (archaic) for the reason (
that ) while
therefor is (obsolete) therefore, for that or this reason or cause.
As a conjunction because
is by or for the cause that; on this account that; for the reason that.
As a preposition because
is .