Why is missouri called "the show me state"?

There are a number of stories and legends behind Missouri's sobriquet "Show-Me" state. The slogan is not official, but is common throughout the state and is used on Missouri license plates. The most widely known legend attributes the phrase to Missouri's U.S. Congressman Willard Duncan Vandiver, who served in the United States House of Representatives from 1897 to 1903. While a member of the U.S. House Committee on Naval Affairs, Vandiver attended an 1899 naval banquet in Philadelphia. In a speech there, he declared, "I come from a state that raises corn and cotton and cockleburs and Democrats, and frothy eloquence neither convinces nor satisfies me. I am from Missouri. You have got to show me." Regardless of whether Vandiver coined the phrase, it is certain that his speech helped to popularize the saying. Other versions of the "Show-Me" legend place the slogan's origin in the mining town of Leadville, Colorado. There, the phrase was first employed as a term of ridicule and reproach. A miner's strike had been in progress for some time in the mid-1890s, and a number of miners from the lead districts of southwest Missouri had been imported to take the places of the strikers. The Joplin miners were unfamiliar with Colorado mining methods and required frequent instructions. Pit bosses began saying, "That man is from Missouri. You'll have to show him." However the slogan originated, it has since passed into a different meaning entirely, and is now used to indicate the stalwart, conservative, noncredulous character of Missourians

Looks like there is no official reason - nor is the slogan itself official. You can read about it here http://www.sos.mo.gov/archives/history/slogan.asp

I'd watch it, but it had better be good the first time, or I ain't watchin it no more. Of course you can't have sharks maiming or killing people; you gotta do up their mouths so's the teeth can't do damage, like catch the shark and put in a sealed tooth guard or something like that. Or maybe just remove all the shark's teeth, but you can't do that to a whole lotta sharks; that would be cruel. Then put the celeb out there and have the shark attack, sure. I'd like to see Bernie Madoff be the first player. Who knows, a toothless shark might be able to gum to death, but if Bernie dies who cares?

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they called it the show me state because some people will say I got 100$ if you kill a person and they do it and some people end up with no money that why if you tell them anything they will say show me

Looks like there is no official reason - nor is the slogan itself official. You can read about it here http://www.sos.mo.gov/archives/history/slogan.asp