Because

союз потому что, так как, поскольку Например: They never lose because they never surrender. — Они никогда не проигрывают, потому что никогда не сдаются.

Большой англо-русский словарь

Because

conjunction Etymology: Middle English because that, because, from by cause that 1. for the reason that; since Example: rested because he was tired 2. the fact that; that Example: the reason I haven't been fired is because my boss hasn't got round to it yet — E. B. White

Энциклопедический словарь Мерриама-Вебстера