Title: Upper Midwest forest–savanna transition
Content:  The Upper Midwest forest–savanna transition is a terrestrial ecoregion that is defined by the World Wildlife Fund. An oak savanna plant community located in the Upper Midwest region of the United States, it is an ecotone (a transitional area) between the tallgrass prairies to the west and the temperate deciduous forests to the east. A part of the Upper Mississippi River basin, it is considered endangered with less than 5% of the original ecosystem remaining intact, due mostly to overgrazing and conversion to agriculture.
Title: North Central Hardwood Forests (ecoregion)
Content:  The North Central Hardwood Forests are a temperate broadleaf and mixed forests ecoregion (no. 51 in the EPA Level III ecoregions of the United States) in central Minnesota, central Wisconsin, and northwestern Lower Michigan, embedded between (clockwise) the Western Corn Belt Plains in the south, the Northern Glaciated Plains, the Red River Valley, the Northern Minnesota Wetlands, and the Northern Lakes and Forests (ecoregion 50, approx. identical with WWF's Western Great Lakes forests). It forms the northern part of the upper Midwest forest-savanna transition, which also includes regions 52 (Driftless Area) and 53 (Southeastern Wisconsin Till Plains).
Title: Eastern forest–boreal transition
Content:  The eastern forest–boreal transition is a temperate broadleaf and mixed forests ecoregion of North America, mostly in eastern Canada. It is a transitional zone or region between the predominantly coniferous Boreal Forest and the mostly deciduous broadleaf forest region further south.
Title: Upper Midwest forest–savanna transition
Content: Quercus macrocarpa (Bur oak) ; Tilia americana (American basswood) ; Acer saccharum (Sugar maple) ; Quercus rubra (Red oak) Trees:
Title: Central forest–grasslands transition
Content:  This is a large area covering 407000 km2 from northern Illinois through most of Missouri, eastern Kansas, Oklahoma and into Texas. This area was traditionally a mixture of woodland and tall grass prairie, which as the soil consists of highly fertile mollisols, most of the area has been converted to farmland. Rainfall varies from 600 to 1040 mm per year and the area is vulnerable to drought and fire. Along with the Upper Midwest forest–savanna transition this ecoregion separates the Central U.S. hardwood forests to the east from the largely treeless Central and Southern mixed grasslands and Central tall grasslands to the west.
Title: Central forest–grasslands transition
Content:  The central forest–grasslands transition is a prairie ecoregion of the central United States, an ecotone between eastern forests and the North American Great Plains. It is a classification defined by the World Wildlife Fund.
Title: Upper Midwest forest–savanna transition
Content: Devil's Lake State Park, on the Baraboo Range in south-central Wisconsin ; Savanna Army Depot in extreme northwestern Illinois ; Parts of the Upper Mississippi River National Wildlife and Fish Refuge in eastern Minnesota and western Wisconsin ; Richard J. Dorer Memorial Hardwood State Forest in the Driftless Area of southeastern Minnesota ; Whitewater State Park, also in the Driftless Area ; Necedah National Wildlife Refuge in central Wisconsin ; Horicon Marsh in southeastern Wisconsin ; Kettle Moraine State Forest in southeastern Wisconsin A survey in 1985 concluded that only 26 km2 of oak savanna remain, roughly 0.02% of what is estimated to have existed at the time of European settlement. Highly dispersed and fragmented, none of the present habitat falls under the designation of National Forests but comes under the administration of the states' Department of Natural Resources organizations or federal entities such as the Fish and Wildlife Service. Remaining intact habitat areas include: 
Title: Midwestern United States
Content:  west, resulting in different types of prairies, with the tallgrass prairie in the wetter eastern region, mixed-grass prairie in the central Great Plains, and shortgrass prairie towards the rain shadow of the Rockies. Today, these three prairie types largely correspond to the corn/soybean area, the wheat belt, and the western rangelands, respectively. Much of the coniferous forests of the Upper Midwest were clear-cut in the late 19th century, and mixed hardwood forests have become a major component of the new woodlands since then. The majority of the Midwest can now be categorized as urbanized areas or pastoral agricultural areas.
Title: Eastern forest–boreal transition
Content:  Upper slope hardwood–conifer mixed forests are an area of transition between the northern hardwood and the mountain conifer forests. They are similar to hardwood–conifer forests, but with no red maple. Red spruce and eastern hemlock, together with sugar maple, yellow birch, and American beech are the dominant species, with scattered white pine.
Title: Oak savanna
Content:  The oak savannas of the Midwestern United States form a transition zone between the arid Great Plains to the west and the moist broadleaf and mixed forests to the east. Oak savannas are found in a wide belt from northern Minnesota and southern Wisconsin, down through Iowa, Illinois, northern and central Missouri, eastern Kansas, and central Oklahoma to north-central Texas, with isolated pockets further east around the Great Lakes including Ontario. The bur oak (Quercus macrocarpa) is the dominant species in northern oak savannas, although black oak (Quercus velutina), white oak (Quercus alba), and Hill's oak (Quercus ellipsoidalis)are sometimes present. The dominant tree in the south is usually the black oak (Quercus velutina), although the chinquapin oak (Quercus muhlenbergii), post oak (Quercus stellata), and black-jack oak (Quercus marilandica) are also common. The flora of the herbaceous layer generally consists of species associated with tallgrass prairies, both grasses and flowering plants, although some woodland species may be present. There are also a few species that are unique to oak savannas. Oak savannas, because of their mixture of grassland, woodland, and unique savanna species, typically have a higher plant diversity than grasslands and woodlands combined.

Question: In what country is Upper Midwest forest-savanna transition?
Answer: United States of America.
the United States of America.
America.
U.S.A.
USA.
U.S.
US.
the US.
the USA.
US of A.
the United States.
U. S. A.
U. S.
the States.
the U.S.
'Merica.
U.S.
United States.
'Murica.