<prompt> Translate the following text to EnglishMwaka 1855 kiongozi wa dini ya Mormon Brigham Young aliitikia ripoti za Las Vegas kwa kutuma wamishonari 30 kwenye bonde hilo, na hatimaye wakajenga ngome karibu na jiji la leo la Downtown.  <response>: In 1855, Mormon leader Brigham Young responded to promising reports of Las Vegas by sending 30 missionary settlers to the valley; they eventually built a fort not far from todays Downtown. 