After which 1968 communist offensive did Walter Cronkite tell Americans the Vietnam War looked unwinnable?

U.S. Senate elections are held every two years in even-numbered years. After 2000, in which year were they next held? 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? In the 1994 film "Wolf", which actor, after being bitten, marks his territory by urinating on James Spader's shoes? After which April 1775 battles did John Adams say "the die was cast, the Rubicon passed"? In the 1981 film "Raiders of the Lost Ark", which archaeologist outruns a giant boulder, only to have rival Belloq stea… After which British poet drowned off Italy in 1822 did his friend E.J. Trelawny snatch his heart from the funeral pyre?