What is urbanization and how did it affect the population density?

Urbanization can increase population density by restricting animal movement, increasing available forage, or decreasing competition by reducing the population size of competitors (e.g., Crooks and Soule´ 1999, Prange et al. 2003, Riley et al. 2006).

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answer; andrew jackson approved nullification by signing it into law,and john calhoun opposed it saying it was unconstitutional;