What does being a "Liberal" mean? (US)

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Deforestation is an important worldwide problem, but there is a reason that map stops at 1920: after that, the US was the model of RE-forestation, and today it would look more like 1850 than 1920.

Originally Posted by wikipedia

For the 300 years following the arrival of Europeans, land was cleared, mostly for agriculture, at a rate that matched the rate of population growth. For every person added to the population, one to two hectares of land was cultivated. This trend continued until the 1920s when the amount of crop land stabilized in spite of continued population growth. As abandoned farm land reverted to forest the amount of forest land increased from 1952 reaching a peak in 1963 of 3,080,000 km² (762 million acres). Since 1963 there has been a steady decrease of forest area with the exception of some gains from 1997. Gains in forest land have resulted from conversions from crop land and pastures at a higher rate than loss of forest to development. Because urban development is expected to continue, an estimated 93,000 km² (23 million acres) of forest land is projected be lost by 2050, a 3% reduction from 1997.