<prompt> Translate the following text to EnglishKarne moja iliyopita, Rais wa Marekani angeweza kuendesha gari la kawaida na walinzi wachache na mtu yeyote angeweza kutembea hadi mlangoni pa Ikulu.  <response>: A half-century ago, a president could drive through city streets in a normal car with a few bodyguards, and anyone could stroll up to the front door of the White House. 