What was America's first national monument?

The Devil’s Tower, Wyoming, established by President Theodore Roosevelt in 1906, was America’s first national monument.

How large is the Silicon Valley? The stretch between San Jose and San Francisco is called Silicon Valley and runs 55 miles.
For how long did New York City have a Miss Subways? The Miss Subways program, run by the New York Subway Advertising Company, started in May 1941 and ended in December 1976. Every month a Miss Subways, a woman over 17, not an actress…
What Indian language is spoken in Dances With Wolves (1990)? Lakota, the language of the Sioux is the Indian language spoken in Dances With Wolves (1990).
What was the first minimum wage? When the first minimum wage was instituted in 1938, it was 25 cents per hour.
How long were the 52 American hostages held in Teheran, Iran? The 52 American hostages were held for 444 days, from November 4, 1979, to January 20, 1981, the day Ronald Reagan was inaugurated president.
Who was the first president to invite an African-American man to the White House? Theodore Roosevelt, who invited Booker T. Washington, was the first president to invite an African-American man to the White House.