<prompt> Translate the following text to SwahiliConstruction on Hoover Dam originally Boulder Dam, subsequently renamed for the president who authorized the project began in 1931 in a canyon 45 miles 72 km southeast of Las Vegas.  <response>: Ujenzi wa bwawa la Hoover walioitwa Boulder Dam, baadaye wakaliita kwa jina la rais aliyeruhusu mradi huo ulianza mwaka 1931 katika bonde la maji lililo kilomita 45 kusini-mashariki mwa Las Vegas. 