To write the Constitution the states had to

They all had to get together, agree, & sign & secure the blessings of liberty

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.

Ifeel like this is a very good quesyion