Question: who created the country borders in the continent with the river that the Tekezé River turns into?

<P0-S0> 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. <P0-S1> flowing entirely in the united states (although its drainage basin reaches into canada), it rises in northern minnesota and meanders slowly southwards for 2,320 miles (3,730 km) to the mississippi river delta at the gulf of mexico. <P0-S2> 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. <P0-S3> the mississippi ranks as the fourth - longest and fifteenth - largest river in the world by discharge. <P0-S4> the river either borders or passes through the states of minnesota, wisconsin, iowa, illinois, missouri, kentucky, tennessee, arkansas, mississippi, and louisiana. <SEP> <P1-S0> In the late 19th century, the European imperial powers engaged in a major territorial scramble and occupied most of the continent, creating many colonial territories, and leaving only two fully independent states: Ethiopia (known to Europeans as ``Abyssinia ''), and Liberia. <P1-S1> Egypt and Sudan were never formally incorporated into any European colonial empire; however, after the British occupation of 1882, Egypt was effectively under British administration until 1922. <SEP> <P2-S0> originating as the chilliwack river in washington's north cascades national park, the river begins at hannegan pass and flows north across the canada–united states border and into chilliwack lake. <P2-S1> the river flows through hells gorge, a deep, dangerous-to-access gorge just below the river's headwaters that is home of a waterfall that the river drops over. <P2-S2> the river picks up the little chilliwack river before crossing the border. <P2-S3> there is a large sandy beach located where the river enters the lake, a popular recreational area among locals. <P2-S4> the river exits the north end of the lake and flows generally west via the chilliwack river valley to emerge on the fraser lowland on the south side of the city of chilliwack. <P2-S5> at vedder crossing, the river is joined by the sweltzer river before flowing under a bridge at which its name changes to the vedder river, after which is flows west and north to join the sumas river just before that river's confluence with the fraser river at the northeast end of sumas mountain. <P2-S6> the river crosses the fraser floodplain from vedder crossing to its confluence with the sumas via the vedder canal, which prevents the river's considerable spring freshet from flooding the surrounding farmlands and towns, and which is part of the drainage system that turned sumas lake into sumas prairie. <SEP> <P3-S0> After entering northeastern Sudan at the tripoint it joins the Atbarah River, which is a tributary of the Nile. <P3-S1> The Tekezé River rises in the central Ethiopian Highlands near Mount Qachen within Lasta, from where it flows west, north, then west again, forming the westernmost border of Ethiopia and Eritrea from the confluence of the Tomsa with the Tekezé at to the tripoint between the two countries and Sudan at . <P3-S2> The Tekezé is perhaps the true upper course of the Atbarah, as the former follows the longer course prior to the confluence of the two rivers. <SEP> <P4-S0> It flows about 805 km (500 mi) to the Nile in north-central Sudan, joining it at the city of Atbarah (). <P4-S1> The river's tributary, the Tekezé (Setit) River, is perhaps the true upper course of the Atbarah, as the Tekezé follows the longer course prior to the confluence of the two rivers (at 14° 10' N, 36° E) in northeastern Sudan. <P4-S2> The Atbarah River (; transliterated: Nahr 'Atbarah) in northeast Africa rises in northwest Ethiopia, approximately 50 km north of Lake Tana and 30 km west of Gondar. <P4-S3> The Atbarah is the last tributary of the Nile before it reaches the Mediterranean.