The constitutional amendments passed during reconstruction were viewed as failures for many reasons. were designed to protect the rights of african americans. showed that jim crow laws would never be tolerated. provided economic opportunity for most african americans.

Option B.

Explanation:

Were designed to protect the rights of African Americans, is the right answer.

Throughout Reconstruction Era three most important constitutional amendments were enacted that meant to help African Americans. These amendments are the 13th, 14th and the 15th amendment. Where the Thirteen Constitutional Amendment abolished slavery and involuntary servitude, the 14th Amendment gave citizenship to all born and nurtured in the United States. Besides, the 15th Amendment gave voting rights to the former slaves and African-American males.

the berlin blockade was an international crisis that arose from an attempt by the soviet union, in 1948–49, to force the western allied powers (the united states, the united kingdom, and france) to abandon their post-world war ii jurisdictions in west berlin. in march 1948 the allied powers decided to unite their different occupation zones of germany into a single economic unit. in protest, the soviet representative withdrew from the allied control council. coincident with the introduction of a new deutsche mark in west berlin (as throughout west germany), which the soviets regarded as a violation of agreements with the allies, the soviet occupation forces in eastern germany began a blockade of all rail, road, and water communications between berlin and the west. on june 24 the soviets announced that the four-power administration of berlin had ceased and that the allies no longer had any rights there.