The Fertile Crescent has been called the crossroads of the world because it was A. The first center of advanced civilization

B. Often flooded by the Tigris and Euphrates Rivers

C. Protected from invasion by the surrounding deserts and mountains

D. On the trade routes connecting Europe, Asia, and Africa

D.  On the trade routes connecting Europe, Asia, and Africa

Explanation:

The Fertile Crescent was widely known as the cradle of civilization. However, it is also known as "Crossroads" because the territory covers a large expanse of lands which spans across three continents, including present Africa, Europe, and Asia. Some of the countries are Egypt, Iraq, Israel, Palestine, Turkey, Jordan, etc.

Hence, the correct answer is option D. On the trade routes connecting Europe, Asia, and Africa

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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.