What si the difference between a legal alien and an ilega alien

Why was hawaii so important to the united states & why did japan bomb pearl harbor?

Explain how social darwinism impact imperialism.

The service industry in the united states grew in the late 1800s. what was one effect of that growth? the number of people with jobs in factories as unskilled workers decreased. the number of people with jobs in factories as unskilled workers increased. the middle class grew as people took jobs as clerks, lawyers, and teachers. the middle class shrank as people left jobs as clerks, lawyers, and teachers.