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<span>The issue of slavery was largely responsible for the party realignment that followed the election of Abraham Lincoln in 1860 because Abraham was the one who fought for the rights of black people in USA and he was the one who killed the racism.</span>
A Historian would look for a primary source (option d. ) - the definition of a primary source is that it was written at the time of the event, and not later (this is the secondary choice).
Answer:
The political system of Central and Northern Italy was characterized by the city states great fragmentation and spirit of autonomy. This situation constituted an insuperable obstacle to any prospect of national unification and a serious barrier even to the formation of smaller state organizations such as the regional states into which Italy later consolidated.
This factor indeed stood them out.