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>And those lands where the animals graze were not forested previously? Since you're comparing with UK examples i'm going to guess you aren't familiar with the

• myshpa 4y ago
  Have you read the referenced article? "For 10,000-20,000 years, native people used fire annually as a tool to assist in hunting, transportation, and safety.[7] Evidence of ignition sources of fire in the tall grass prairie are overwhelmingly human as opposed to lightning.[8] Humans, and grazing animals, were active participants in the process of prairie formation and the establishment of the diversity of graminoid and forbs species. Fire has the effect on prairies of removing trees, clearing dead plant matter, and changing the availability of certain nutrients in the soil from the ash produced. Fire kills the vascular tissue of trees, but not prairie species, as up to 75% (depending on the species) of the total plant biomass is below the soil surface and will re-grow from its deep (upwards of 20 feet[9]) roots. Without disturbance, trees will encroach on a grassland and cast shade, which suppresses the understory. Prairie and widely spaced oak trees evolved to coexist in the oak savanna ecosystem.[10]" https://en.wikipedia.org/wiki/Prairie#Formation https://en.wikipedia.org/wiki/Prairie#Formation