What events led up to the monroe doctrine?

The imperialistic nature of Europe at the time coupled with Englands claims on Asia, India, and Australia. Lead the United States to assume the role of defender of the Northern Hemisphere and reject further imperialistic advances- much like the containment policy used by Regan during the Cold War.

Ifound this on google “the existence of agglomeration economies is central to the explanation of how cities increase in size and population, which places the phenomenon on a larger scale. the concentration of economic activity in cities is one reason for their development and growth.” i hope this you for what your looking for.