John Fitzgerald Kennedy 35th president of the United States, the   youngest person ever to be elected president.   He was also the first  Roman Catholic president and the first president to be born in the  20th century. Kennedy was assassinated before he completed his third  year as president. Therefore his achievements were  limited.  Nevertheless, his influence was worldwide, and his handling of the  Cuban Missile Crisis may have prevented war. Young people especially  liked him. No other  president was so popular. He brought to the  presidency an awareness of the cultural and historical traditions of  the United States. Because Kennedy expressed the values of  20th-century America, his presidency was important beyond its  political achievements.   John Kennedy was born in Brookline,  Massachusetts. He was the second of nine children.  Kennedy announced his candidacy early in 1960. By the time the  Democratic National Convention opened in July, he had won seven  primary victories. His most important had been in West Virginia, where  he proved that a Roman Catholic could win in a predominantly  Protestant state.  When the convention opened, it appeared that Kennedy's only serious  challenge for the nomination would come from the Senate majority  leader, Lyndon B. Johnson of Texas.  However, Johnson was strong only  among Southern delegates. Kennedy won the nomination on the first  ballot and then persuaded Johnson to become his running mate.  Two weeks later the Republicans nominated Vice President Richard Nixon  for president and Henry Cabot Lodge, Jr., who was ambassador to the  United Nations and whom Kennedy had defeated for the Senate in 1952,  for vice president. In the fast-paced campaign that followed, Kennedy  made stops in 46 states and 273 cities and towns, while Nixon visited  every state and 170 urban areas.  Another important element of the campaign was the support Kennedy  received from blacks in important Northern state...