How does checks and balances work?

The "nationalists" and fascists battled against the "republicans" and communists in a civil war in the 1930s in

Select the five weaknesses of the articles of confederation. congress could not declare war or establish an army. congress could not levy taxes. congress could not control trade. not all the states were represented in congress. no national court system. no executive to enforce the laws. congress could not negotiate with foreign governments. the national government could not borrow money. nine of the states had to agree to pass a law.

How did people in the 14th century understand black death