What are the benefits are of equilibrium for buyers and sellers ?

If there equilibrium you are selling the ammount of the item buyers want to buy and there  is no shortage or surplus, buyers make up the demand side of the market and sellers make up the supply side of the market and as buyers and sellers interact, the market will tend toward an equilibrium price.

a.) d-day invasion of normandy.

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when world war i broke out across europe in 1914, president woodrow wilson proclaimed the united states would remain neutral, and many americans supported this policy of nonintervention. however, public opinion about neutrality started to change after the sinking of the british ocean liner lusitania by a german u-boat in 1915; almost 2,000 people perished, including 128 americans. along with news of the zimmerman telegram threatening an alliance between germany and mexico, wilson asked congress for a declaration of war against germany. the u.s. officially entered the conflict on april 6, 1917.