Associated Press The rapid expansion of COVID-19 vaccinations to senior citizens across the U.S. has led to bottlenecks, system crashes and hard feelings in many states because of overwhelming demand for the shots. Mississippi’s Health Department stopped taking new appointments the same day it began accepting them because of a “monumental surge” in requests. People had to wait hours to book vaccinations through a state website or a toll-free number Tuesday and Wednesday, and many were booted off the site because of technical problems and had to start over. In California, counties begged for more coronavirus vaccines to reach millions of their senior citizens. Hospitals in South Carolina ran out of appointment slots within hours. Phone lines were jammed in Georgia.