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

in february 1787, congress decided that a convention should be convened to revise the articles of confederation, the nation’s first constitution. in may, 55 delegates came to philadelphia, and the constitutional convention began. debates erupted over representation in congress, over slavery, and over the new executive branch. the debates continued through four hot and muggy months. but eventually the delegates reached compromises, and on september 17, they produced the u.s. constitution, replacing the articles with the governing document that has functioned effectively for more than 200 years.