Canon law differed from governmental law because canon law included the varying beliefs of the Church. Governmental law didn't.
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By forming various organizations.
The European Union, for example, unites Europe (Minus Britain these days) under one banner, thus preventing fighting.
A more direct example is the North Atlantic Treaty Organization. NATO protects the "North Atlantic" and Europe from terrorists and invading countries by using the combined military strength of multiple nations.
Answer:
At the onset on the war, in 1861 and 1862, they stood as relatively equal combatants. The Confederates had the advantage of being able to wage a defensive war, rather than an offensive one. They had to protect and preserve their new boundaries, but they did not have to be the aggressors against the Union.
The answer is C long and bloody
The president's amnesty power pardons those who have violated the law.
The president's clemency power can only be used in cases of state offenses.