What is quasi natural

Quasi-natural experiments, by contrast, do not involve random application of a treatment. Instead, a treatment is applied due to social or political factors.

usually, however, secession was popular enough without the of community leaders. prominent unionists, on the other hand, were a major reason that texas did not secede before march 1861. the most important of these was sam houston, the governor of the state from 1859 to 1861.

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fir trees are found in areas with cooler climates. fir trees have needles for leaves and remain green year-round.