What are some social motives for imperialism?

The book by john kenneth galbraith discussed the growing gap between the increasing private wealth in the u.s. and the stagnant condition of resources allocated to the public sector.

After nine states had ratified the constitution by mid-1788, other states quickly followed. all thirteen states had to obey it. it became law in the united states. none of the states had to obey it.

Why is illegal immigration a controversial issuea. people think that the current laws on immigration address the issue well.b. there are far fewer illegal immigrants each year than naturalized citizens.c. americans disagree on weather immigration law should change to address it.d. most naturalized citizens first entered the united states as illegal immigrants.