Trench warfare in World War I was characterized by... A. Heavy casualties and little territorial gain
B. A series of Russian victories
C. Swift invasions and decisive attacks
D. Tremendous German victories in the East

Mainly Trench Warfare was popularized by the use of new mechanized weapons such as Artillery, and also because of the mass victories in the east on germany's side, Russia used these as a form of slowing them down and to protect their troops, but often these trenches hurt these men by disease, starvation, etc.

the constitution of the united states gave congress the absolute authority over immigration laws

well the fact it is basically a peninsula allowed trade to come from many places, thus allowing cultural diffusion to take place. india has seasonal monsoons that merchants travel back and forth from india using the monsoons wind patterns