<prompt> Translate the following text to EnglishKampuni za Marekani zimefanikiwa kwa sababu zimekuwa na viongozi wenye nguvu wanaoziongoza, na bodi ya wakurugenzi yenye ufanisi na yenye nguvu inaweza kupinga mtendaji mwenye nguvu.  <response>: United States firms have been successful because they have had strong leaders running them, and an effective and strong board of directors can counterbalance a strong executive. 