Once a year Muslims from around the world--representing a vast range of ethnicities, incomes, ages, and attitudes--perform the Hajj (pilgrimage) and converge in the holy city of Mecca in Saudi Arabia. Now, the global diversity of Muslims at the Hajj is almost repliacted in the United States: new immigrants, Muslims whose families have been here for generations, and converts are coming together, seeing what unites them and what issues they face together. Project MAPS (Muslims in the American Public Square) began in 1999 to provide much-needed information on this understudied and immensely...