U.S. Senate elections are held every two years in even-numbered years. After 2000, in which year were they next held?

After the U.S. government declined to buy which estate and tomb, a ladies' association bought it for $200,000 in 1858? After the Revolutionary War, Congress voted which Prussian a pension, and he became a U.S. citizen in 1783? After the War of 1812, which president asked Congress to declare war on Algiers? After the White House, which president retired to his Lancaster estate, where he died a bachelor in 1868? Born in Annonay, France, in 1740 and 1745, which brothers sent the first people aloft in a hot-air balloon? After they invaded China and captured Beijing in 1644, which people established the Qing dynasty? After which 1906 disaster did Mayor Eugene Schmitz authorize the shooting of looters? After which 1968 communist offensive did Walter Cronkite tell Americans the Vietnam War looked unwinnable?