Did the tank make movement across no mans land and the trenches possible

Which factor has played the most important role in changing the way history is studied over time?

What explains the increase in life expectancy in botswana? a. the increased availability of jobs and an improved economy b. access to antiretroviral drugs, hiv/aids education, and widespread hiv/aids testing c. a series of military takeovers that stabilized the political system and led to education reform and increased literacy rates d. a recent military coup that led to an improved healthcare system select the best answer from the choices provided.

During the revolutionary war what was the definition of loyalist