Being timed ( PLS HELP )

Why is it useful for historians to base certain studies on the analysis of historical themes

The loss of two major sources of income crippled the french economy right before the onset of the great depression what were they? wine industry foreign tourism wool manufacturing war reparations

From the soviet point of view, which reagan policy most threatened to create a new arms race? a. strategic defense initiative b. u.s. support for israel c. aid to the anti-soviet rebels in afghanistan d. iran-contra scandal