What effects did submarines (U-Boats) in ww1

Germany retaliated by sinking neutral ships supplying the Allies with its submarines. The fearsome U-boats (unterseeboots), armed with torpedoes, patrolled the Atlantic. 

As Britain effectively barred German ports from imports, they were Germany's only weapon of advantage.

sir thomas more, venerated in the catholic church as saint thomas more, was an english lawyer, social philosopher, author, statesman, and noted renaissance humanist. he was also a councillor to henry viii, and lord high chancellor of england from october 1529 to 16 may 1532.

whose power in the senate is equal to the power of the speaker of the house?