As according to the separation of powers, each of the three branches is to have a different job. The executive branch executes the law, the judicial branch interprets the law, and the legislative branch makes the laws. Because congress is part of the executive branch, their job would be to execute or introduce the law.
I believe the answer is: A microhistorian might document one day in a town that experienced particularly high unemployment levels, while a comparative historian might graph unemployment levels in several cities throughout the Great Depression.
Microhistorian tend to choose that method because they tend to favour a more intensive research within smaller unit of research (such as villages, small neighbourhood, etc). Comparative historian on the other hand, might choose that method because they favour research technique that collect as many data as possible from one segment of historical period and compared it with the another.
Seven other left-handers have occupied the Oval Office since Garfield, including Herbert Hoover, Harry S. Truman, Gerald Ford, Ronald Reagan, George H.W. Bush, Bill Clinton and Barack Obama.
