With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: South America is home to the Mississippi River.
text_B: The Mississippi River is the chief river of the second largest drainage system on the North American continent , second only to the Hudson Bay drainage system .. drainage system. Drainage system ( geomorphology ). Hudson Bay. Hudson Bay. river. river. Mississippi. Mississippi. Flowing entirely in the United States -LRB- although its drainage basin reaches into Canada -RRB- , it rises in northern Minnesota and meanders slowly southwards for 2320 mi to the Mississippi River Delta at the Gulf of Mexico .. Gulf of Mexico. Gulf of Mexico. drainage basin. drainage basin. Minnesota. Minnesota. Mississippi River Delta. Mississippi River Delta. Mississippi. Mississippi. With its many tributaries , the Mississippi 's watershed drains all or parts of 31 U.S. states and 2 Canadian provinces between the Rocky and Appalachian Mountains .. tributaries. Tributary. watershed. Drainage basin. Rocky. Rocky Mountains. Appalachian Mountains. Appalachian Mountains. Mississippi. Mississippi. The Mississippi ranks as the fourth longest and fifteenth largest river in the world by discharge .. fourth longest. List of rivers by length. fifteenth largest. List of rivers by discharge. river. river. Mississippi. Mississippi. The river either borders or passes through the states of Minnesota , Wisconsin , Iowa , Illinois , Missouri , Kentucky , Tennessee , Arkansas , Mississippi , and Louisiana .. Minnesota. Minnesota. river. river. Wisconsin. Wisconsin. Iowa. Iowa. Illinois. Illinois. Missouri. Missouri River. Kentucky. Kentucky. Tennessee. Tennessee. Arkansas. Arkansas. Mississippi. Mississippi. Louisiana. Louisiana. Native Americans long lived along the Mississippi River and its tributaries .. tributaries. Tributary. Mississippi. Mississippi. Native Americans. Indigenous peoples of the Americas. Most were hunter-gatherers , but some , such as the Mound Builders , formed prolific agricultural societies .. Mound Builders. Mound Builders. The arrival of Europeans in the 16th century changed the native way of life as first explorers , then settlers , ventured into the basin in increasing numbers .. The river served first as a barrier , forming borders for New Spain , New France , and the early United States , and then as a vital transportation artery and communications link .. river. river. New Spain. New Spain. New France. New France. In the 19th century , during the height of the ideology of manifest destiny , the Mississippi and several western tributaries , most notably the Missouri , formed pathways for the western expansion of the United States .. tributaries. Tributary. Missouri. Missouri River. Mississippi. Mississippi. manifest destiny. manifest destiny. Formed from thick layers of the river 's silt deposits , the Mississippi embayment is one of the most fertile agricultural regions of the country , which resulted in the river 's storied steamboat era .. river. river. Mississippi. Mississippi. silt. silt. Mississippi embayment. Mississippi embayment. steamboat. Steamboats of the Mississippi. During the American Civil War , the Mississippi 's capture by Union forces marked a turning point towards victory due to the river 's importance as a route of trade and travel , not least to the Confederacy .. river. river. Mississippi. Mississippi. American Civil War. American Civil War. Union. Union ( American Civil War ). Confederacy. Confederate States of America. Because of substantial growth of cities and the larger ships and barges that supplanted riverboats , the first decades of the 20th century saw the construction of massive engineering works such as levees , locks and dams , often built in combination .. engineering works. River engineering. locks. Lock ( water navigation ). Since modern development of the basin began , the Mississippi has also seen its share of pollution and environmental problems -- most notably large volumes of agricultural runoff , which has led to the Gulf of Mexico dead zone off the Delta .. Gulf of Mexico. Gulf of Mexico. Mississippi. Mississippi. Gulf of Mexico dead zone. Gulf of Mexico dead zone. In recent years , the river has shown a steady shift towards the Atchafalaya River channel in the Delta ; a course change would be an economic disaster for the port city of New Orleans .. river. river. Atchafalaya River. Atchafalaya River. New Orleans. New Orleans
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