Explain how the revolutions of 1848 contributed (positively or negatively) in the unification of germany?

series of republican revolts against European monarchies, beginning in Sicily, and spreading to France, Germany, Italy, and the Austrian Empire. They all ended in failure and repression, and were followed by widespread disillusionment among liberals.

the  seven  days  battles  were  a series of seven battles over seven  days from june 25 to july 1, 1862, near richmond, virginia,  during  the american civil war. the  seven  days ended with mcclellan's army in relative safety next to the james river, having suffered almost 16,000 casualtiesduring  the retreat.

i need the diagram.