How many times have the major political parties held their national conventions in Los Angeles?

The major political parties held their national conventions in Los Angeles only once.

The Democratic Party nominated John F. Kennedy in Los Angeles in July 1960.

Why did the Whig Party in the U.S. call themselves Whigs? Formed in 1834 to oppose President Andrew Jackson, the Whig Party took its name from the British anti-monarchical party, the Whigs, to underline their conflict with the man they viewed as "King Andrew."…
Who was the first female to hold a post in the U.S. Cabinet? The first female to hold a post in the U.S. Cabinet was Frances Perkins. She served as Secretary of Labor under Franklin D. Roosevelt from 1933 to 1945.
What year was Martin Luther King Day first observed as a federal holiday? Martin Luther King Day was first observed as a federal legal public holiday on January 20, 1986.
In what century did Europeans discover Alaska? Europeans discovered Alaska in the 18th century. Vitus Bering, a Dane working for the Russians, and Alexei Chirikov discovered Alaska and the Aleutian Islands in 1741.
When did baseball’s New York Giants become the San Francisco Giants? The New York Giants moved to San Francisco for the start of the 1958 season. The final game of the New York Giants at New York's Polo Grounds was played against the Pittsburgh…
Who has been killing spiders since he was thirty? Alvy Singer (Woody Allen) in Annie Hall (1977), had been killing spiders since he was thirty.