Question: The trail that D.O. Quick crossed connected the Missouri River to what?

<P0-S0> Cow Creek is a tributary of the Missouri River, approximately 35 mi long, in north central Montana in the United States. <P0-S1>  Cow Creek rises in the southern foothills of the Bear Paw Mountains in western Blaine County and flows east and then south, joining the Missouri approximately 25 mi northeast of Winifred, Montana—or 22 mi upstream from the Fred Robinson Bridge. <P0-S2>  Cow Creek flows down to the Missouri in a canyon that passes through the Missouri Breaks, which are severely eroded badlands that extend out on either side from the Missouri River. <P0-S3>  The floor of Cow Creek canyon provided a pathway of travel from the Montana plains north of the river, down to the Missouri – at the mouth of Cow Creek, Cow Island made fording the Missouri easier – a steep but short trail on the south bank of the Missouri opposite Cow Creek completed this route which led from the northern Montana plains to the central and southern Montana plains. <P0-S4>  This pathway was used by migrating buffalo/bison and nomadic American Natives for centuries. <P0-S5>  During the steamboat era on the Missouri River, when low water prevented riverboats getting up to Fort Benton, the mouth of Cow Creek became a river landing and freighting depot, and it was the start of the Cow Island Trail by which freight was moved on to Fort Benton by going north up Cow Creek and then west. <P0-S6>  In 1877 the Nez Perce Indian Tribe, fleeing to Canada, had several skirmishes along Cow Creek including the "Battle of Cow Island", and several days later at a camp on Cow Creek the Nez Perce, thinking themselves now beyond the reach of the U.S. Army, made the fateful decision to slow down, rather than push on for the Canada–US border. <P0-S7>  Today, modern highways have by passed Cow Creek, and the buffalo and the nomadic Indian are gone. <P0-S8>  Cow Creek is dormant, in one of the most remote spots of the isolated regions of the vast area known as the Montana Missouri Breaks. <SEP> <P1-S0>  The eastern part of the Oregon Trail spanned part of the future state of Kansas, and nearly all of what are now the states of Nebraska and Wyoming. <P1-S1> The Oregon Trail is a 2170 mi historic east–west, large-wheeled wagon route and emigrant trail in the United States that connected the Missouri River to valleys in Oregon. <P1-S2>  The western half of the trail spanned most of the future states of Idaho and Oregon. <SEP> <P2-S0> The Boonslick, or Boone's Lick Country, is a cultural region of Missouri along the Missouri River that played an important role in the westward expansion of the United States and the development of Missouri's statehood in the early 19th century. <P2-S1>  The Boone's Lick Trail, a route paralleling the north bank of the river between St. Charles and Franklin, Missouri, was the primary thoroughfare for settlers moving westward from St. Louis in the early 19th century. <P2-S2>  Its terminus in Franklin marked the beginning of the Santa Fe Trail, which eventually became a major conduit for Spanish trade in the American Southwest. <P2-S3>  Later it connected to the large emigrant trails, including the Oregon and California Trails, used by pioneers, gold-seekers and other early settlers of the West. <P2-S4>  The region takes its name from a salt spring or "lick" in western Howard County, where Nathan and Daniel Morgan Boone, sons of famed frontiersman Daniel Boone, built a homestead in 1807. <SEP> <P3-S0> David O. Quick (August 27, 1829 – December 1910) was an American educator and politician in the state of Oregon. <P3-S1>  He served one term as a Republican in the Oregon House of Representatives. <P3-S2>  A native of Indiana and a trained lawyer, he crossed the Oregon Trail where he was a school teacher and later farmer.