How many presidents have served as speaker of the House of Representatives?

Only one president has served as speaker of the House of Representatives James K. Polk (president 1845-49).

He was speaker of the House from 1835 to 1839.

What war did the Republican congressmen dubbed “War Hawks” call for in 1810? The young Republican congressmen from southern and western states known as the "War Hawks", including Henry Clay of Kentucky and John C. Calhoun of South Carolina, demanded war against Great Britain in 1810-11.…
Who was the first president born after the United States declared its independence? The eighth president, Martin Van Buren (1836-1844), was born on December 5, 1782, after the United States declared its independence.
What are the executive departments represented in the president’s cabinet? In alphabetical order, the executive departments are: Agriculture, Commerce, Defense, Education, Energy, Health and Human Services, Housing and Urban Development, Interior, Justice, Labor, State, Transportation, Treasury, and Veterans Affairs.
Did any U.S. president serve in the Confederate government? One U.S. president did serve in the Confederate government. John Tyler (president 1841-45) represented Virginia in the Confederate House of Representatives beginning in 1861.
When were Tinkertoys invented? In 1913, Illinois stonemason Charles Pajean brought the toy he created for his children to the American Toy Fair in New York City. Within one year, 1 million Tinkertoy sets had been sold.
What happened to Ichabod Crane? At the end of The Legend of Sleepy Hollow (1819), Washington Irving's schoolmaster Ichabod Crane disappears after being hit by the Headless Horseman's "head."